At traffic light junctions and at cycle-only crossings with traffic lights, you MUST NOT cross the stop line when the traffic lights are red.
Some junctions have an advanced stop line to enable you to position yourself ahead of other traffic and wait (see Rule 178). When the traffic lights are red, you may cross the first stop line, but you MUST NOT cross the final stop line.
- Road Traffic Act 1988: Section 36
- The Traffic Signs Regulations and General Directions 2002: Regulations 10 & 36(1)