An information sign
No through road
A blue square with a red bar across the top of a white 'T' means no through road - the road (or the turning it marks) is a dead end for vehicles.
01
What it means
Blue rectangular signs give information, and this one saves you a wasted trip: vehicles can't get through, so unless your destination is on that street, don't turn in. Sometimes there's a footpath or cycle route continuing where cars can't - the sign only promises the DRIVING dead end.
Mounted at a junction it can mark just one arm - the bar sits over the arm that's closed.
02
Where you'll see it
Residential culs-de-sac, streets closed at one end by bollards or modal filters, and increasingly on low-traffic-neighbourhood boundaries.
03
On your driving test
Useful route-planning information: if the examiner (or sat nav) directs you somewhere and you spot the sign, expect a turn-around ahead - and remember the turning-in-the-road skills, because this is where you'll use them.
Often confused with
Quick answers
Can I still drive into a no through road?
Yes, if your destination is on it - the sign is information, not a prohibition. You just can't get out the other end.
Why does my sat nav send me through one?
Newer street closures (bollards, planters, low-traffic filters) often lag behind map data. The sign on the street wins over the map.
Sign artwork is Crown copyright, reproduced under the Open Government Licence v3.0; meanings from the Highway Code (gov.uk).
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