Road markings in the theory test: white diagonal stripes, double white lines and climbing lanes
Updated •5 min read
White diagonal stripes or chevrons separate traffic lanes or protect traffic turning right. If a solid white line borders chevrons you must not enter, except in an emergency; a broken white border means you should enter only if necessary and safe (Highway Code rule 130).
Road markings are a common source of theory test questions because the rules are short and the wording matters. This page covers the markings that people search for most, with the rule numbers to check. For the signs themselves, see our road signs guide.
White diagonal stripes and chevrons (rule 130)
Rule 130 describes areas of white diagonal stripes or chevrons painted on the road. Two details decide the answer:
- If the area is bordered by a broken white line, you should not enter unless it is necessary and you can see it is safe.
- If it has chevrons and is bordered by solid white lines, you must not enter except in an emergency.
The difference between "should not" and "must not" is the part a question is likely to test.
Double white lines (rules 128 and 129)
What the lines mean depends on which line is nearer to you, as the same page explains (gov.uk: rules 103 to 158).
| Marking | What the Highway Code says |
|---|---|
| Double white lines, nearer line broken (rule 128) | You may cross to overtake if it is safe and you can finish before a solid white line on your side. |
| Double white lines, nearer line solid (rule 129) | You must not cross or straddle it, except to enter premises or a side road. |
Rule 129 also allows you to cross, if the road is clear, to pass a stationary vehicle. You may also pass a pedal cycle, horse or road maintenance vehicle travelling at 10 mph or less.
Centre lines and lane dividers (rules 127 and 131)
A broken white line marks the centre of the road. When the line lengthens and the gaps shorten, there is a hazard ahead (rule 127). Short broken white lines on wide roads divide lanes, and you should keep between them (rule 131).
Climbing lanes (rule 139)
Climbing and crawler lanes are provided on some hills. Rule 139 says to use the lane if you are driving a slow-moving vehicle or if there are vehicles behind you wishing to overtake.
It also says to be aware of the signs and road markings that show the lane is about to end. The other rules for overtaking on dual carriageways are rules 137 and 138 on the same page, set out in our dual carriageways guide.
Yellow box junctions (rule 174)
Rule 174 says you must not enter the box until your exit road or lane is clear (gov.uk: rules 159 to 203). You may enter and wait to turn right if the only thing stopping you is oncoming traffic or other vehicles waiting to turn right.
Zig-zag lines at crossings (rule 191)
Rule 191 says you must not park on a crossing or in the area covered by the zig-zag lines. You also must not overtake the moving vehicle nearest the crossing. Our pedestrian crossings guide covers the other crossing rules.
Yellow lines
The Highway Code road markings page says double yellow lines mean no waiting at any time, unless signs show seasonal restrictions (gov.uk: road markings). It also says yellow marks on the kerb or the edge of the carriageway mean loading and unloading is prohibited.
How to learn them
The Highway Code is one of the books the questions are based on. The Highway Code guide explains how it fits into revision. Read the rule, then ask what the question changes: which line is nearer, whether the border is solid or broken, or whether there is an emergency.
The free practice questions are a way to test yourself, and the theory test topics guide shows where road markings sit among the other areas.
Check your road marking knowledge
The free theorytest.ai diagnostic shows which topics need work. theorytest.ai is independent and is not affiliated with the DVSA. Do not rely on this page for rules outside the Highway Code, because local signs and markings can differ.
Frequently asked questions
What do white diagonal stripes on the road mean?
They separate traffic lanes or protect traffic turning right. With a broken white border, enter only if necessary and safe. With solid borders and chevrons, do not enter except in an emergency.
Can you cross double white lines?
It depends on which line is nearer to you. If it is broken, you may cross to overtake safely. If it is solid, you must not cross, apart from the exceptions in rule 129.
What is a climbing lane for?
It is for slow-moving vehicles on hills, and for use when vehicles behind you want to overtake. Watch for signs and markings that show the lane is ending.
When can you enter a yellow box junction?
Not until your exit road or lane is clear. You may enter and wait if you are turning right and only oncoming or other right-turning traffic blocks you.
Are road markings in the theory test?
Road markings come from the Highway Code, which the test questions draw on. Gov.uk does not publish the questions or say how many are about markings.