What Exactly is a Double Mini Roundabout?
A double mini roundabout is a type of road junction designed to manage traffic flow more efficiently, particularly where space is limited or where multiple exit routes need to be accommodated without creating a large, single-lane circulatory carriageway. It essentially comprises two smaller roundabouts placed close together, linked by a short segment of road. Each mini-roundabout operates independently according to standard mini-roundabout rules, but they function as a single, sequential junction. This design aims to reduce congestion and improve journey times by allowing vehicles to pass through the junction system more fluidly than they might on a traditional, larger roundabout.
The primary purpose of this layout is to prevent the lengthy queues that can form at larger, more complex junctions. By breaking down the decision-making process into two smaller stages, drivers can negotiate the junction more readily. This is especially useful in built-up areas or where road networks converge. Understanding how each mini-roundabout functions, and the rules that govern your movement between them, is fundamental to using these junctions safely and without causing obstruction.
The Sequential Nature of Double Mini Roundabouts
Unlike a single, large roundabout where you might need to select your exit from the moment you enter, a double mini roundabout requires a two-stage approach. You will approach the first mini-roundabout, select your lane and exit based on your intended destination. Once you have navigated the first mini-roundabout, you will then proceed along the short connecting road to the second mini-roundabout, where you will repeat the process for your final onward route. This sequential operation means you only need to consider the immediate next step at each stage, simplifying the decision-making process.
The signage for these junctions is crucial. You will typically see standard mini-roundabout signs indicating the central island and the direction of traffic flow (anti-clockwise in the UK). Additionally, directional signs will be present before the first mini-roundabout, indicating which lane to use for different exits, including those that require navigating both stages of the junction. It’s imperative to pay close attention to these signs, as they dictate which mini-roundabout and which lane within it you should use for your specific journey.
- Each mini-roundabout is a separate entity with its own central island.
- Traffic flows anti-clockwise around each island in the UK.
- Drivers must yield to traffic already on the roundabout from their right.
- Signage is critical for lane discipline and destination selection.
The design is a clever compromise, offering the traffic management benefits of a roundabout while mitigating the potential for confusion and delay associated with larger, more complex designs. It’s a common sight in areas where space is at a premium, such as town centres or junctions serving busy local roads.
Understanding the Rules of Mini Roundabouts
Before delving into the specifics of a double mini roundabout, it's vital to grasp the fundamental rules governing any mini-roundabout, as these apply to each component of the double system. At its core, a mini-roundabout operates on the principle of yielding to traffic already on the roundabout, which, in the UK, always comes from the right. This means that when you approach a mini-roundabout, you must give way to any vehicles already circulating on it, regardless of their intended exit. This rule is paramount for preventing collisions and ensuring a smooth flow of traffic.
Key Mini Roundabout Regulations
The Highway Code provides clear guidance on navigating these junctions. Drivers must be aware of their intended exit before reaching the roundabout and position themselves correctly in the appropriate lane. While mini-roundabouts often have only one lane entering and exiting, some may have multiple lanes, especially as part of a double system. If multiple lanes are present, signs and road markings will indicate which lane to use for different destinations.
When you enter a mini-roundabout, you must always pass to the left of the central island. This central island is often marked with white studs or a painted area. You must not drive over the central island unless it is physically impossible to avoid doing so without creating a hazard. The speed limit on mini-roundabouts is typically 20 mph, though this can vary depending on local signage and speed restrictions. Driving too fast is a common mistake that can lead to misjudgement and accidents.
Crucially, drivers should look to the right for approaching traffic and signal their intentions clearly. For traffic on a standard mini-roundabout, a general rule is to signal left when leaving. If you are taking the first exit, you would signal left before entering. If you are going straight ahead, you would typically signal left after passing the exit before the one you intend to take. For exits beyond straight ahead, you would signal right upon approaching, indicating your intention to go around the roundabout, and then switch to a left signal as you pass the exit before your intended one, preparing to leave.
A common point of confusion is the yielding rule. Remember, you only yield to traffic already on the roundabout coming from your right. If there is no traffic on the roundabout, you do not need to stop. This simple principle, when followed diligently, ensures that the roundabout operates efficiently and safely. The sequential nature of a double mini roundabout means you apply these rules twice.
Always check your mirrors and blind spots before signalling and moving off from a mini-roundabout, especially if traffic is light, as other vehicles may be approaching faster than you anticipate.
What About Specific Signage?
The primary sign for a mini-roundabout is a triangular sign with a red border and a blue circle containing three white arrows depicting a clockwise circulation around a central island. This sign is usually accompanied by a sign showing the layout of the junction and indicating the correct lane discipline. For double mini-roundabouts, these signs will appear sequentially. There isn't a specific "mini roundabout sign" that looks different from the standard one; it's the context and the proximity of two such junctions that define it as a double mini roundabout.
The absence of a specific "double mini roundabout sign" means drivers rely on standard junction signage and road layout interpretation. Where lanes are marked, they are designed to guide you through the entire double junction. For example, a lane might be marked for 'straight ahead' which could mean continuing through the first mini-roundabout and then taking the first exit of the second. Or it might be for 'right turn', requiring you to go around both islands and take the final exit.
Navigating the Double Mini Roundabout: Step-by-Step
Navigating a double mini roundabout involves a sequential application of mini-roundabout rules. Think of it as two mini-roundabouts in series. You approach the first one, negotiate it according to standard rules, then proceed to the second and repeat the process. The key is to identify your intended final exit early and then plan your route through both stages.
Stage 1: Approaching the First Mini Roundabout
As you approach the first mini-roundabout, observe the directional signs and road markings. These will indicate which lane to use for your intended final destination. For example, if you need to take the third exit, and the double mini roundabout has four exits in total (two on each), you'll likely need to use a lane that will take you around both islands. If you're taking an early exit, you'll use a lane that serves the first mini-roundabout's initial exits.
When you reach the yield line, check for traffic approaching from your right on the first mini-roundabout. Give way to any vehicles already circulating. Once it's safe, proceed to the left of the central island. If you are taking the first or second exit (typically straight ahead or left turn), you will signal left before entering and maintain that signal. If you are taking an exit that requires you to go around the first island and proceed to the second mini-roundabout (e.g., a right turn or 'U' turn equivalent), you will signal right as you approach and prepare to enter.
Stage 2: The Connecting Road and Second Mini Roundabout
After exiting the first mini-roundabout, you will drive along the short stretch of road connecting it to the second mini-roundabout. If you were signalling right to go further around the junction, you would maintain this signal until you have passed the exit for the first mini-roundabout. As you approach the second mini-roundabout, you will need to re-evaluate traffic from your right. Apply the same yielding principle: give way to traffic already on the second mini-roundabout coming from your right.
Your lane discipline here is critical. If your initial lane on the first mini-roundabout was designated for onward travel through the second roundabout, you will likely remain in that lane. If you signalled right for the first mini-roundabout, you will now need to switch to a left signal as you approach your final exit on the second mini-roundabout. Always be mindful of other vehicles and their potential movements.
The decision-making process is split: first for the initial roundabout, then for the second. This is the core principle that distinguishes it from a single, larger junction.
Many drivers find double mini-roundabouts confusing because they are unsure whether to signal on entry to the first roundabout for their final destination or for the immediate exit. The general principle is to signal for your intended *route*. If your route involves going around the first roundabout and proceeding to the second, you signal right. If your route involves exiting the first roundabout, you signal left as you approach.
Common Mistakes and How to Avoid Them
One common error is treating the entire double mini roundabout as one large junction. This can lead to incorrect lane choices on the first roundabout, forcing awkward manoeuvres or dangerous crossings of lanes on the connecting road or second roundabout. Always treat each mini-roundabout as a distinct decision point.
Another mistake is failing to yield correctly on the second roundabout, assuming that because you navigated the first, you have priority. This is incorrect; the yielding rule applies independently to both.
When exiting the first mini-roundabout to continue to the second, ensure you are in the correct lane for your onward journey. Do not cut across lanes on the connecting road; use your mirrors and signal if you need to change lanes, but ideally, select the correct lane on the first roundabout.
Finally, confusion over signalling is rife. Remember: signal right if you intend to go past the halfway point (i.e., to the second mini-roundabout and beyond), and signal left if you intend to take an early exit from the first roundabout. If going straight ahead on the first roundabout, signal left as you approach and maintain it. If going straight ahead on the second roundabout after approaching it from the first, signal left as you pass the exit before your intended one.
Lane Discipline and Signalling
Effective lane discipline and correct signalling are paramount when navigating double mini roundabouts. These junctions, comprising two linked mini-roundabouts, demand a precise understanding of which lane to occupy and how to communicate your intentions to other road users. Unlike a single, large roundabout where lane choices might be complex, the double mini roundabout simplifies this by breaking it into two distinct phases. However, this phasing also introduces new considerations for signalling, particularly when planning to proceed through both stages.
Lane Selection on Approach
Directional signs and road markings are your primary guides. Before reaching the first mini-roundabout, you must identify the lane that corresponds to your final destination. If your route involves taking an early exit (first or second exit on the first mini-roundabout), you will typically use the left-hand lane. For destinations requiring you to proceed to the second mini-roundabout (often third or fourth exits of the combined junction), you will usually use the right-hand lane. Always prioritise signs indicating your specific route, as local variations can exist.
It is a frequent error for drivers to select a lane based solely on the immediate exit of the first mini-roundabout, only to find themselves in the wrong lane for the second. This can lead to dangerous lane-crossing manoeuvres on the short connecting road or upon entering the second roundabout. The intention should be to guide yourself through the entire double junction system from the outset.
Signalling Strategy Explained
The signalling strategy for a double mini roundabout is perhaps the most confusing aspect for many drivers. The golden rule is to signal your intention to leave the roundabout. However, for routes that require you to navigate both mini-roundabouts, you must also signal your general direction of travel upon entering the first roundabout.
- Taking an early exit (e.g., first or second exit) from the first mini-roundabout: Signal left as you approach the first mini-roundabout. Maintain this signal as you circulate and exit. You will not need to signal on the second roundabout if you are exiting it immediately.
- Proceeding to the second mini-roundabout (e.g., third or fourth exit of the combined junction): Signal right as you approach the first mini-roundabout. This indicates you intend to go past the first exit. As you pass the exit for the first mini-roundabout, switch your signal to the left, indicating your intention to exit the system via the second mini-roundabout.
The signalling for the second mini-roundabout mirrors that of any single mini-roundabout. You must yield to traffic from the right. If you are taking an early exit from the second roundabout, you signal left as you approach. If you are going straight ahead (relative to the second roundabout's layout), you signal left after passing the exit before your own. If you are taking a later exit, you signal right upon approach and then switch to a left signal as you pass the preceding exit.
A key point to remember is that the connecting road between the two roundabouts is part of the circulatory system. You should not be performing lane changes here unless absolutely necessary and safe to do so, and ideally, your lane choice on the first roundabout should render this unnecessary.
Effective use of mirrors, coupled with clear, timely signalling, is the bedrock of safe navigation on complex junctions like double mini roundabouts.
Drivers must also be aware of other vehicles' signals, or lack thereof, and be prepared to react defensively. The presence of clear, consistent signage from the highway authority is vital in helping drivers make the correct lane and signalling choices, but ultimately, it is the driver's responsibility to understand and apply these rules.
Safety Considerations and Hazard Perception
Double mini roundabouts, while designed for efficiency, present unique challenges that require heightened safety awareness. The sequential nature of these junctions means drivers must remain focused through two sets of decision points, and the shorter connecting road can sometimes lead to misjudgements about speed and distance. Understanding potential hazards and adopting a defensive driving approach is crucial for preventing accidents.
Common Hazards on Double Mini Roundabouts
One significant hazard is the tendency for drivers to rush. The perceived efficiency of the junction can lead some to accelerate aggressively, particularly on the connecting road between the two roundabouts. This reduces reaction time and increases the risk of colliding with vehicles on the second roundabout or misjudging the speed of oncoming traffic. Always maintain a speed appropriate for the junction's complexity and visibility.
Another common issue is failing to yield correctly on the second mini-roundabout. Drivers might assume that because they successfully navigated the first, they have a clear path. However, traffic approaching the second roundabout from the right must always be given priority. This is particularly true if the connecting road has multiple lanes, and a driver might move into a lane that leads them directly into the path of a vehicle already on the second roundabout.
Visibility can also be an issue on some double mini roundabouts, especially those with landscaping or street furniture that obscures sightlines. Drivers must make a conscious effort to look beyond their immediate field of vision and anticipate potential conflicts. Cyclists and motorcyclists can be harder to spot, and their movements can be more erratic, so extra vigilance is required.
The critical safety principle is sequential vigilance: maintain full situational awareness at the first roundabout, then again at the second.
Poor lane discipline is a major contributor to accidents. Drivers cutting across lanes on the connecting road or entering the second roundabout from an inappropriate lane can cause sudden braking or swerving, leading to collisions. This is often a result of incorrect lane selection on the first roundabout or a failure to understand the traffic flow of the combined junction.
Before approaching any double mini roundabout, particularly one you are unfamiliar with, try to identify your intended exit and corresponding lane well in advance. If in doubt, slow down and observe the traffic flow and signage.
Defensive Driving Techniques
A defensive approach involves anticipating the actions of other drivers and being prepared to react. This means:
- Scanning: Continuously scan the road ahead, to the sides, and in your mirrors. Look for potential hazards, such as fast-approaching vehicles, cyclists, or pedestrians.
- Anticipation: Try to predict what other drivers might do. Are they signalling correctly? Do they appear uncertain? Are they speeding?
- Space: Maintain a safe distance from the vehicle in front. This gives you more time to react if they brake suddenly or if a hazard appears.
- Awareness: Be aware of the road conditions, especially in wet or icy weather, which can increase braking distances and reduce tyre grip.
On a double mini roundabout, this translates to being particularly cautious when entering the second roundabout, even if you had a clear run on the first. Always check for traffic from your right, and ensure you are in the correct lane for your exit. If you are unsure about another driver's intentions, it is always safer to wait and let them pass.
When to Use Which Type of Exit
The design of a double mini roundabout serves to manage traffic flow for various destinations, from immediate turns to continuing journeys that require navigating both stages. Understanding which lane and which roundabout to use for specific exits is fundamental to efficient and safe passage. This requires careful observation of road signs and an understanding of the junction's sequential nature.
Navigating Early Exits (First Mini Roundabout)
If your destination is one of the first two exits on the first mini-roundabout (typically meaning turning left or going straight ahead), you will usually use the left-hand lane as you approach. You will signal left before entering the first mini-roundabout. As you circulate, pass to the left of the central island, and then exit at your intended point. You would then continue on your way, having effectively used only the first part of the double junction system.
For these early exits, your engagement with the second mini-roundabout is minimal or non-existent. You will not need to signal right upon approaching the first roundabout, as your intention is not to proceed further into the junction complex. It is essential to make this lane choice early, as attempting to change lanes on the connecting road or on the first roundabout itself can be hazardous.
Proceeding to the Second Mini Roundabout
Destinations that require you to proceed to the second mini-roundabout typically correspond to the third or fourth exits of the combined junction. For these routes, you will generally use the right-hand lane on approach to the first mini-roundabout. As you approach, you will signal right, indicating your intention to go further around the junction. This signal should be maintained as you circulate the first mini-roundabout and pass its first exits.
Upon passing the exit for the first mini-roundabout, you will then approach the second mini-roundabout. It is at this point that you should switch your signal to the left, indicating your intention to leave the junction system. You must then yield to traffic approaching from your right on the second mini-roundabout before proceeding to your chosen exit. This two-stage signalling and yielding process is crucial for communicating your intentions to other drivers and ensuring safety.
The principle is to signal your intended route: right for going around, left for exiting. For double mini roundabouts, this applies sequentially.
'U' Turns and Complex Routes
Routes that involve a 'U' turn, or a turn that would normally require going past the 'straight ahead' point on a single roundabout, will almost certainly require navigating both mini-roundabouts. You would approach the first, use the right lane, signal right, circulate, pass the immediate exits, then approach the second roundabout, switch to a left signal after passing the exit before your intended one, and exit. This is effectively a combination of the 'proceeding' strategy for the first roundabout and then taking a specific exit from the second.
It is vital to remember that road markings and signage are the definitive authority. While these general principles apply to most double mini roundabouts in the UK, specific layouts may have variations. Always look for the white directional arrows on blue signs, as these provide the most accurate information for lane discipline and destination routing.
If you are unsure about the correct lane or signalling procedure for a specific double mini roundabout, it is always safer to pull over before the junction (if possible) or to take a route you are familiar with if time permits. When in doubt, drive defensively and observe other drivers.
Double Mini Roundabouts vs. Other Junction Types
The double mini roundabout is one of many junction designs used on UK roads, each with its own advantages and disadvantages. Understanding how it differs from other common types, such as single mini-roundabouts, larger multi-lane roundabouts, and signal-controlled junctions, helps clarify its purpose and optimal use.
Comparison with Single Mini Roundabouts
The most obvious difference is scale and complexity. A single mini-roundabout is a simple, one-stage junction. Drivers approach, yield, circulate, and exit. A double mini roundabout doubles this process. While both adhere to the fundamental rule of yielding to traffic from the right, the double system requires drivers to make two distinct sets of decisions and adhere to lane discipline for two separate circulatory areas. This sequential nature is the defining characteristic.
The primary benefit of a double mini roundabout over a single one is its capacity to handle higher traffic volumes and more complex turning movements without becoming a bottleneck. A single mini-roundabout can quickly become congested if multiple vehicles wish to turn right or go straight ahead simultaneously. The double system distributes this traffic more effectively.
Compared to Larger, Multi-Lane Roundabouts
Larger roundabouts, especially those with multiple lanes on entry and exit, can be daunting for less experienced drivers. They often require drivers to make lane choices far in advance and navigate complex circulatory carriageways. The double mini roundabout offers a potential advantage here by breaking down the decision-making into two smaller, more manageable stages. Each mini-roundabout is inherently less intimidating than a large, multi-lane circulatory road.
However, larger roundabouts might offer more direct routes or clearer lane guidance for very complex junctions with many exits. The double mini roundabout is typically suited for situations where two main flows of traffic need to be managed efficiently, or where space constraints prevent a larger, single roundabout. They are not ideal for junctions with an extremely high number of exits spread around a single point.
The key differentiator is the segmented approach: two mini-roundabouts versus one larger, continuous circulatory carriageway.
Versus Signal-Controlled Junctions (Traffic Lights)
Signal-controlled junctions rely on traffic lights to manage flow. They can be highly efficient when traffic is heavy and predictable, ensuring all approaches get a fair share of green time. However, they can also lead to significant delays during off-peak hours when traffic is light, as drivers may have to wait unnecessarily for a red light.
Double mini roundabouts, like all roundabouts, are generally more fluid during off-peak times, as drivers only stop if traffic from the right dictates. They can be more efficient for drivers making simple turns or going straight ahead, as they don't have to wait for a light cycle. However, during peak hours, a poorly designed or overloaded double mini roundabout can still cause significant congestion, arguably more so than a well-timed traffic light system that can actively manage conflicting movements.
The choice between a roundabout and traffic lights often comes down to traffic flow analysis, space availability, and safety considerations. Roundabouts tend to promote slightly better safety records for certain types of collisions (e.g., head-on or severe right-angle crashes) due to lower speeds and less severe impact angles, although they can sometimes see an increase in side-swipe incidents due to lane discipline issues.
When approaching any unfamiliar junction, look for the direction signs well in advance. This gives you time to assess the junction type and plan your lane choice and signalling strategy.
Benefits and Drawbacks of the Design
The double mini roundabout design is a specific engineering solution to traffic management challenges. Like any road junction, it comes with its own set of advantages that make it suitable for certain locations, alongside potential drawbacks that can lead to confusion or inefficiency if not properly understood or implemented.
Advantages of Double Mini Roundabouts
The primary benefit is improved traffic flow and capacity in constrained spaces. By dividing a complex intersection into two smaller, sequential roundabouts, engineers can manage traffic more effectively than with a single, large roundabout in the same footprint. This can reduce journey times and minimise the build-up of queues, especially during busy periods.
They can also simplify the decision-making process for drivers compared to a large, multi-lane roundabout. Instead of having to identify their final exit from a wide range of options upon entering a single circulatory carriageway, drivers negotiate the junction in two stages. This can make them feel less intimidating for some road users, particularly if the signage is clear and the lanes are well-defined.
Another advantage is that they often keep speeds lower than on larger roundabouts, as the tighter turns on mini-roundabouts naturally encourage reduced speed. Lower speeds generally lead to fewer and less severe accidents, enhancing overall road safety, particularly in urban environments where pedestrian and cyclist activity is high.
The core advantage lies in managing complexity within limited space.
Furthermore, the sequential nature can be beneficial for drivers performing 'U' turns or right turns that would require extensive circulation on a single roundabout. By breaking the journey into two stages, these manoeuvres can feel more straightforward, provided the driver understands the correct lane discipline and signalling.
Disadvantages and Common Criticisms
The most significant drawback is confusion for drivers, particularly those unfamiliar with the junction. The sequential nature, combined with potentially complex lane markings and signalling requirements (especially for right turns), can lead to errors in judgement, incorrect lane changes, and potential collisions. The short connecting road between the two roundabouts can also be a point of contention, with drivers sometimes failing to yield or signal correctly when entering the second stage.
Signage can sometimes be inadequate or confusing, which exacerbates these issues. If drivers cannot clearly identify which lane to use for their intended destination, they may resort to last-minute, unsafe manoeuvres. The reliance on drivers correctly interpreting two sets of mini-roundabout rules in quick succession is a potential point of failure.
For very high traffic volumes, even a double mini roundabout can become a bottleneck. If the capacity of the road network beyond the junction cannot absorb the outgoing traffic, queues can still form, negating some of the design's intended benefits. In such scenarios, a larger, more complex junction or a signal-controlled intersection might be more appropriate.
The design can also be challenging for larger vehicles, such as lorries and buses, which may struggle to navigate the tight turns of mini-roundabouts without mounting the central island or crossing into other lanes. While designed to be navigable by all road users, the compact nature of mini-roundabouts can pose specific difficulties for these larger vehicles.
Pay close attention to the chevrons marked on the central islands of mini-roundabouts; they indicate the direction traffic must pass. Do not drive over these markings unless absolutely necessary for safety.
Identifying and Understanding Road Signs
Effective navigation of a double mini roundabout hinges on understanding the road signs and markings that guide drivers. Unlike some specialised junctions, there isn't a single, unique 'double mini roundabout' sign. Instead, drivers must interpret standard traffic signs and junction layouts in sequence. The clear communication provided by these signs is crucial for safety and efficiency.
Standard Mini Roundabout Signage
The primary indicator of a mini-roundabout is the familiar triangular sign with a red border. Inside this triangle, you typically see a blue circular sign featuring three white arrows indicating a clockwise circulation around a central island. This sign is usually placed at the entrance to the roundabout. For double mini roundabouts, these signs will appear at the entry to both the first and second roundabouts.
Accompanying these are often larger blue directional signs placed in advance of the junction. These signs display the junction layout and indicate which lane to use for different destinations. For a double mini roundabout, these signs will show the progression through both stages. For example, a sign might show that the left lane leads to the first exit of the first roundabout, while the right lane continues to the second roundabout and its subsequent exits.
Road markings on the carriageway also play a vital role. Lane lines will guide you into the correct lane on approach. On the roundabout itself, white studs or painted lines delineate the central island. The 'give way' lines (often a series of white triangles pointing towards the approaching vehicle) clearly mark where you must stop or slow down to yield to traffic from the right.
Interpreting Directional Signs
Directional signs are paramount for navigating double mini roundabouts correctly. These signs use a combination of text (destination names), route numbers, and arrows to indicate the correct path. For double mini roundabouts, these signs are often designed to show the entire journey through the junction:
- Early Exits: Signs will typically show the first, second, and possibly third exits (relative to the first roundabout's entry) with a left-hand arrow, often indicating the left lane.
- Continuing Routes: Signs for destinations that require navigating both roundabouts will often show a right-hand arrow, indicating the right lane. These signs may show a diagram of both roundabouts to illustrate the path.
It's important to look for signs that indicate your specific route. For instance, a sign might say 'City Centre Straight Ahead' with a diagram showing you entering the first roundabout, bypassing its first exit, and taking the first exit of the second roundabout. This implies using the right lane on approach to the first roundabout and then signalling left for the second.
The clarity of directional signs is key to avoiding confusion.
When approaching a double mini roundabout, scan for directional signs as early as possible. If you miss your intended sign, it is safer to proceed to the next junction or a safe place to stop and consult a map than to make a sudden, unsafe manoeuvre.
Signs Specific to Lane Discipline
Beyond directional signs, look for specific lane markings, such as 'only' signs showing a lane is for a particular manoeuvre (e.g., 'Left lane only' or 'Left and Straight ahead only'). These signs are crucial when the junction has multiple lanes. For double mini roundabouts, these markings help ensure you are in the correct lane for whichever mini-roundabout you intend to use and for which exit you are aiming.
If a lane is marked with arrows indicating it leads to both the first and second roundabouts, it usually implies that you can use this lane for various destinations that go beyond the immediate exits of the first roundabout. The signalling then becomes your primary communication tool for your exact intent.