Road markings
Centre line
What it means
Short white dashes with long gaps down the middle of the road mark its centre, separating traffic going in opposite directions. Keep to the left of it. Do not cross it unless you can see the road is clear and you want to overtake or turn off (Rule 127).
Highway Code Rule 127 — 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.