Roundabouts and Mini Roundabouts: Signals, Lanes and Who Goes First

Searches for "mini roundabout" climbed this week, and that makes sense. Roundabouts look simple on the diagram and feel anything but simple when there is a bus on your right, a cyclist on your left and someone behind you who wants you gone. The good news is that the Highway Code rules are short. If you learn them properly, the theory questions on roundabouts become easy marks, and your lessons get calmer too.

Who goes first

The basic rule is in Rule 185 of the Highway Code: when you reach a roundabout you normally give priority to traffic approaching from your right. Signs, road markings or traffic lights can change that, so read the approach rather than assuming.

One detail catches people out. Even where the markings let you join without giving way, the Highway Code still tells you to look right before you go. Learners who are told "you've got a green light" tend to stop looking. Keep looking.

Before you get anywhere near the give way line, Rule 184 asks you to use mirrors, signal and manoeuvre at every stage and to decide your exit early. A lot of roundabout trouble starts with someone working out where they are going while already on it.

Signals and lanes: left, ahead and right

Rule 186 sets out three cases, and this is where most theory questions come from.

Turning left (the first exit): signal left as you approach, use the left lane, keep to the left on the roundabout and keep signalling left as you leave.

Going right, or all the way round: signal right on the approach, use the right hand lane, and keep to the right until you need to change lanes to leave. Signal left after you pass the exit before the one you want.

Going ahead, or any exit in between: pick the right lane on the approach. You normally do not need to signal as you approach. Stay in that lane and signal left after you pass the exit before yours.

That last signal is the one learners forget, and it matters. A driver waiting at your exit has no idea whether you are about to leave or carry on round. Your left signal is their cue to pull out. Leave it off and you make them guess; put it on too early and they may pull out in front of you.

Where there are more than three lanes, the rule is to use the most appropriate lane on approach and through the roundabout. In practice, lane markings and signs on the approach do the work here, so read them early.

Mini roundabouts: same rules, less room

Rule 188 says to approach a mini roundabout in the same way as a normal one. All vehicles must pass round the central markings, with one exception: large vehicles that physically cannot.

So the white painted circle is not decoration. Driving straight over it in a car is wrong, even if the road is empty and it would save you a second. The Highway Code also reminds you that there is less space to manoeuvre and less time to signal, which is the real difficulty. Things happen fast, and a car from the right can arrive at almost the same moment you do.

Two more points from Rule 188 are worth remembering for the test. Avoid making U-turns at mini roundabouts. And be aware that other drivers might do it anyway, so do not assume the car going round will take an exit.

For double mini roundabouts, Rules 189 and 190 say to treat each roundabout separately and give way to traffic from the right at each one. The same goes for those complex junctions with a series of mini roundabouts. Treat them one at a time and they stop being scary.

Cyclists, horse riders and long vehicles

Rule 186 tells you to give cyclists priority and plenty of room on a roundabout. Do not try to overtake them within their lane, and let them cross your path to leave or go round.

Cyclists, horse riders and horse drawn vehicles may stay in the left lane even when they are going across or round the roundabout, and signal right to show they are not leaving. That looks odd if you are not expecting it. The rule for you as a driver is simple: do not cut across them as you join. This links closely to the cyclist rules in our post on the Dutch Reach and close passing.

Rule 187 lists what else to watch for: pedestrians on the approach and exit roads, traffic crossing in front of you (especially vehicles leaving at the next exit), vehicles straddling lanes or in the wrong position, motorcyclists, and long vehicles. A lorry, or a car towing a trailer, may need to take a different course or straddle lanes. If a long vehicle is signalling but positioned strangely, give it room rather than squeezing alongside.

How this comes up in the theory test

Roundabout questions usually test one of three things: which lane and signal for a given exit, what to do at a mini roundabout, or which other road user needs extra space. If you can draw the left, ahead and right cases from memory, you have most of it.

A tip that works: next time you are a passenger, call out the signal and lane for each roundabout before the driver does it. It sounds silly, but it turns the rule into a habit, and it shows you how often real drivers forget the left signal on the way off. Road signs on the approach matter too, and our guide to the road signs learners get wrong covers the ones you will meet there.

Practise the questions, not just the rules

Reading the rules once is not the same as answering questions under time pressure. Theory Test Passed is DVSA licensed and has practice questions on roundabouts, lanes and road users alongside the rest of the test. Start free at theorytestpassed.co.uk, or get the app for iPhone or Android.