---
title: "Ahead Only Sign Meaning | UK Road Signs | Fast Track"
url: https://fasttrackdrivinglessons.co.uk/theory/road-signs/compulsory-ahead-only
description: "Learn the UK Ahead Only sign rules, Highway Code ref P.605, theory test practice questions, and junction guidance."
lang: en
---

# Ahead only — UK road sign

This mandatory blue sign orders drivers to proceed straight ahead and forbids turning left or right.

Image: Ahead only — blue and white circle UK road sign (https://fasttrackdrivinglessons.co.uk/signs/compulsory-ahead-only.svg)

A circular blue sign containing a vertical white arrow pointing upwards instructs drivers that they must proceed straight ahead.

It is installed at junctions where side turning is prohibited to maintain traffic flow, avoid high-risk turn conflicts, or protect one-way street networks.

## What this sign means

Vehicular traffic must continue straight ahead; turning left or right at the junction is strictly prohibited.

It acts as a positive mandatory instruction rather than a prohibition sign.

- Vertical white arrow pointing upwards on a blue disc.
- Mandatory requirement to drive straight ahead.
- Bans left and right turns at the intersection.

## What to do when you see it

Maintain a central lane position and continue straight through the junction.

Do not activate directional indicators, and do not attempt to turn into side streets at this location.

## How this sign is tested

Theory exams test recognition of mandatory directional signs versus informational ahead signs.

Questions evaluate junction diagrams where candidates must identify permitted vehicle manoeuvres.

## Common mistakes

Confusing 'Ahead Only' (blue circle) with 'One-Way Traffic' (blue rectangle with 'One Way' text or thick arrow).

Attempting to turn into side streets despite the clear mandatory vertical arrow.

## Test yourself on this one

Road and traffic signs is the biggest category in the question bank with 102 questions, and signs turn up inside other categories too. Work through them free, no sign-up needed.

Practise road sign questions (https://fasttrackdrivinglessons.co.uk/theory/practice)

## Frequently asked questions

What is the difference between Ahead Only and One Way signs?

Ahead Only is a circular blue sign instructing you to drive straight ahead at a junction, while One Way (rectangular) indicates a single-direction road.

Can I perform a U-turn at an Ahead Only sign?

No, you must proceed straight ahead without making any turning movements.

Are cyclists exempt from Ahead Only signs?

Cyclists must obey the sign unless a supplementary plate explicitly exempts them.

## Passed your theory? Get the practical booked

Your theory certificate lasts two years. Most learners who use it quickly do it with an intensive course — a block of hours with a DVSA approved instructor and a practical test at the end, instead of one lesson a week for months.

Intensive course prices: https://fasttrackdrivinglessons.co.uk/pricing
All courses: https://fasttrackdrivinglessons.co.uk/courses
Crash courses: https://fasttrackdrivinglessons.co.uk/crash-courses
Automatic lessons: https://fasttrackdrivinglessons.co.uk/driving-lessons/automatic
Areas we cover: https://fasttrackdrivinglessons.co.uk/driving-lessons-in
Driving test centres: https://fasttrackdrivinglessons.co.uk/driving-test-centres
How it works: https://fasttrackdrivinglessons.co.uk/how-it-works
Test pass guarantee: https://fasttrackdrivinglessons.co.uk/test-pass-guarantee

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