Solid and broken lines: what is the difference?

A solid line must not be crossed in the cases set out by law; a broken line may be crossed when the manoeuvre is otherwise lawful and safe.

What longitudinal road markings require

Longitudinal lines separate traffic directions or lanes and show how to use the carriageway. A continuous line must not be crossed in the cases set out by the Highway Code and its regulations; a broken line may be crossed when the manoeuvre is allowed and can be completed safely. A broken line does not automatically make an overtake lawful: prohibitions, sight distance, other vehicles and sufficient room to return to your lane still matter.

Where there are double lines, check which line is nearest your direction of travel and the specific layout. Lines may separate lanes, mark an edge or guide traffic near junctions. Do not confuse longitudinal markings with the transverse stop line. Colours and layouts must be read under the regulations, together with signs and road conditions.

• A solid line prohibits crossing in the cases provided for by law.
• A broken line does not authorise a prohibited or dangerous manoeuvre.
• Check visibility, space and upright signs before overtaking.

When does a line end?

Road markings apply along the section where they are present and may be accompanied by upright signs specifying an overtaking ban or other requirements. A broken section before a bend does not remove the need to see enough road to complete the manoeuvre. If a line is worn or obscured, proceed with particular care and consider the visible signs and surroundings; do not treat missing paint as permission.

At roadworks, temporary markings may change how traffic is channelled. Follow the temporary route, cones and directions from traffic officers. Roadworks markings are not mere suggestions: they organise a temporary traffic layout.

A useful rule for driving

Overtaking also involves signalling, keeping a safe lateral distance and returning to your lane: do not start if the vehicle ahead has already signalled a manoeuvre or someone behind has begun to overtake. A broken line near a hump or junction does not guarantee adequate visibility. If you cannot see the full distance needed, stay in your lane and wait for a safe place. The line is important guidance, but judging visibility remains the driver’s responsibility.

Quiz Patente Ufficiale offers chapter-based study of road markings, timed quizzes and review of mistakes.