Sharing the road doesn’t always feel fair, but it isn’t guesswork either. At junctions especially, there are clear rules that determine who has priority. Knowing these rules—and using good judgement alongside them—is key to driving safely and confidently.
The Core Rules of Right of Way
In the UK, right of way is largely based on two simple principles. Traffic on a main road has priority over traffic joining from a minor road, and vehicles travelling straight ahead or turning left take priority over those turning right.
In reality, these rules often overlap. For example, you might be on a main road but still need to give way if you’re turning right across oncoming traffic. Because of this, every junction requires you to quickly assess both the road layout and the movement of other vehicles.
Junction layouts
T-Junctions
A T-junction is one of the most common and straightforward types of junction. One road ends and joins another, forming a “T” shape.
The first thing to establish is whether you’re on the main road or the minor road. If your road continues ahead, you’re on the main road. If it ends and forces you to turn left or right, you’re on the minor road.
If you’re travelling along the main road, you usually have priority over vehicles joining from the side. However, this changes if you intend to turn right, as you must then give way to oncoming traffic. Even when you do have priority, it’s important to stay alert—drivers pulling out from minor roads may be slow to accelerate, and you may need to adjust your speed.
If you’re emerging from a minor road, you must give way in all directions. You should wait patiently for a safe gap in traffic and only pull out when you can do so without forcing other drivers to slow down.
Crossroads
Crossroads can be more complex, as traffic may be moving in four directions at once. The level of control at the junction determines how you approach it.
At controlled crossroads with traffic lights, the process is straightforward: follow the signals. However, turning right still requires caution. Even with a green light, you must give way to oncoming traffic unless a filter arrow specifically gives you priority.
At marked crossroads without lights, priority usually follows the same main-road rules. Traffic travelling along the main road has priority, particularly when going straight or turning left. If you’re turning right, you must give way to vehicles coming towards you. Drivers emerging from minor roads must always wait for a safe gap.
A slightly more nuanced situation arises when you’re facing another vehicle on the opposite minor road. If you’re going straight ahead or turning left, you will usually have priority. If both of you are turning right, neither has clear priority, so communication—often through eye contact and careful positioning—becomes essential.
Unmarked crossroads are the most unpredictable. With no signs or markings, no one technically has priority. In practice, the first vehicle to arrive often proceeds first, but this isn’t guaranteed. In these situations, caution, observation, and clear communication matter far more than rigid rules.
Roundabouts
Roundabouts are designed to keep traffic flowing, and their rules are consistent across most layouts. As you approach, you must give way to traffic already on the roundabout—particularly traffic coming from your right.
Entering safely requires judgement. You need to assess how fast approaching vehicles are moving, whether they are signalling to exit, and whether your entry would force them to brake. Only proceed when you’re confident you won’t disrupt the flow.
Once you’re on the roundabout, you generally have priority, but you should still stay aware of other drivers, as lane changes and missed signals are common.
Mini-roundabouts follow the same rules, but the reduced space means decisions happen more quickly. It’s not unusual for multiple vehicles to approach at once, so caution and awareness are especially important.
Some larger roundabouts include traffic lights, which override the usual rules when active. Others may have left filter lanes that allow you to bypass the roundabout entirely. In these cases, road markings and signs will guide you.
Slip Roads and Merging
Joining a road from a slip road can feel intimidating because you’re merging into moving traffic. The key rule is simple: traffic already on the road has priority.
Your goal is to match the speed of the traffic and merge smoothly into a suitable gap. This requires good use of mirrors and awareness of your blind spot. While other drivers may adjust their speed or move lanes to help, you should never rely on this. Always be prepared to slow down or stop if necessary.
The Importance of Observation
Understanding the rules is only part of safe driving. Observation is what allows you to apply those rules correctly in real situations.
You should always be aware of what’s happening around you—how fast other vehicles are moving, how close they are, and what they might do next. This includes not just cars, but also cyclists, motorcyclists, and pedestrians.
The Mirror–Signal–Manoeuvre routine helps structure this awareness. Before taking any action, check your mirrors, signal your intention, and then carry out the manoeuvre safely. At junctions, this process is essential for judging gaps and avoiding hazards.
Different Types of Junctions
Junctions can vary not just in layout, but in visibility and control.
An open junction gives you a clear view of the road you’re joining, making it easier to judge whether it’s safe to proceed. A closed or blind junction restricts your view, often requiring you to slow down, stop, and edge forward carefully until you can see clearly.
Marked junctions provide guidance through signs and road markings, making priority easier to understand. Unmarked junctions, on the other hand, require you to rely entirely on observation and judgement, as no one has defined priority.
You’ll commonly encounter T-junctions, crossroads, roundabouts, and staggered junctions, each requiring slightly different positioning and awareness.
Approaching and Emerging from Junctions
Dealing with junctions safely starts well before you reach them. Spotting a junction early gives you time to adjust your speed, choose the correct lane, and signal your intentions.
As you approach, you should check your mirrors and be aware of traffic around you, including vehicles behind or overtaking. Positioning is also important—especially when turning right, where you need to be correctly aligned without blocking other traffic.
Emerging from a junction is where careful judgement matters most. You should only move when you can clearly see that it’s safe, taking into account the speed and distance of approaching vehicles. Once you commit, act decisively—hesitation can be just as dangerous as rushing.
After joining a new road, a quick mirror check helps you settle into the flow of traffic safely.
Common Driving Test Mistakes
Junctions are one of the most common areas where learners lose marks. The biggest issue is poor observation—failing to check mirrors or properly assess traffic before moving.
Other common mistakes include approaching too quickly or too slowly, positioning the car incorrectly when turning, and pulling out in a way that forces other drivers to react. Hesitation can also be a problem, as it suggests uncertainty and can disrupt traffic flow.
Final Thoughts
Right of way isn’t just about memorising rules. It’s about understanding how those rules apply in constantly changing situations. Even when you technically have priority, staying alert and prepared to react is what truly keeps you—and everyone else on the road—safe.