A stop line is a thick, solid white line painted across the carriageway at junctions controlled by a Stop sign, traffic light, or level crossing.
Unlike broken give way lines, crossing a stop line without bringing your wheels to a complete rest is illegal and a common cause of driving test failure.
What this sign means
The solid white stop line indicates the exact position where your vehicle must come to a complete standstill.
It is used where visibility on approach is restricted or where traffic lights and railway crossings dictate vehicle stopping points.
- Junction stop line: Used alongside an upright STOP sign.
- Signal stop line: Used at traffic signals, level crossings, and police control.
- Advanced stop line: Creates a cycle reservoir at traffic lights.
What to do when you see it
Apply your brakes smoothly and bring the vehicle to a total halt just behind the line. Never let your front bumper overhang the marking.
Once fully stopped at a junction, carry out effective observations to both sides before proceeding when it is safe to do so.
How this sign is tested
Theory questions test your knowledge of legal obligations at stop lines, particularly differentiating them from give way lines.
On the practical test, 'rolling stops' (slowing down without completely stopping wheels) will result in an immediate serious or dangerous fault.
Common mistakes
Drivers often mistake stop lines for give way lines and slowly roll through when visibility appears clear.
Another error is stopping too far past the line, which blocks pedestrian crossings or encroaches into high-risk collision zones.
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Practise road sign questionsFrequently asked questions
Must I pull the handbrake up at a stop line?
No, applying the handbrake is not legally mandatory, but your wheels must completely stop moving.
What should I do if my view is blocked after stopping at the line?
Stop at the line first, then creep forward slowly ('peep and creep') until your sightlines improve.
Are stop lines present at traffic lights?
Yes, traffic lights always feature a solid white stop line that you must not cross when the light is red or amber.