Road signs, Ahead only
What does the ahead only sign mean?
Proceed straight ahead only. Turning is not permitted here.
A blue circle with a white arrow pointing straight up.
What you must do
Continue straight on. Do not turn left or right at this point.
Where you will see it
Junctions where turns are banned to keep traffic flowing.
Test yourself
The theory test asks you to recognise signs like this one. Try the road and traffic signs quiz (with an easy and a hard set), or read the signs revision notes. Source: Know Your Traffic Signs.
Other common road signs
National speed limitSpeed limitNo entryStopGive wayNo waitingNo stopping (clearway)Turn left aheadTurn right aheadOther dangerNo U-turnsNo left turnNo right turnNo overtakingWeight limitNo motor vehiclesKeep leftKeep rightMini-roundaboutMinimum speedCrossroads aheadT-junction aheadRoundabout aheadBend aheadTwo-way trafficTraffic signals aheadRoad narrowsSlippery roadPedestrians in roadParking
Meaning based on Know Your Traffic Signs and The Highway Code under the Open Government Licence v3.0. The sign image is our own simplified rendering for learning. Always check the current Highway Code on gov.uk. Not affiliated with or endorsed by the DVSA.