Road markings
Stop line at traffic lights or police control
What it means
A single solid white line straight across your side of the road, where traffic lights or a police officer control the traffic. When the red light is showing you MUST NOT move forward over the white line (Rule 176), so stop with the front of your car behind it rather than on it. If an officer is directing traffic, it is where you wait when signalled to stop.
Highway Code Rule 176 — read it on GOV.UK
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Other road markings
Road marking pictures: The Highway Code (Department for Transport and Driver and Vehicle Standards Agency), © Crown copyright. Used under the Open Government Licence v3.0.