DVSA theory topic
Road and Vehicle Markings theory test questions
What lines on the road and markings on vehicles tell you — from white lines to hazard plates. Practise 25 questions free, each with the correct answer and a plain-English explanation mapped to the Highway Code.
What you need to know
- A solid white centre line means don't cross or straddle it (with few exceptions).
- Longer white lines mean greater hazard ahead; double whites with a solid line on your side mean no overtaking.
- Long vehicles may show a hazard 'tail' marking — give them room to turn.
Sample question
If you see a tank vehicle displaying a diamond symbol with a 3 in it, it means the vehicle is
- not travelling in the right direction.
- carrying a load overhanging by more than 3 metres.
- part of the road works equipment.
- carrying dangerous goods (flammable liquid).
Why
Certain tank vehicles carrying dangerous goods must display hazard information panels. If you see such panel with a diamond symbol with number 3 in it, it means the vehicle is carrying flammable liquid. Other dangerous goods codes include (6) - toxic substance, (5.1) - oxidizing substance, (2) - non-flammable compressed gas, (7) - radioactive substance, (4) - spontaneously combustible substance, (8) - corrosive substance.
Common mistake
Crossing a solid white line to overtake — only allowed to pass a stationary obstruction or slow cyclist/horse.
Exam tip
Match line length and solidity to 'how serious is the hazard / can I cross?'.