Keep Straight Ahead

Keep Straight Ahead signs appear at junctions where turning movements are prohibited but straight-through movement is permitted, common in urban traffic management schemes throughout Dublin, Cork, Galway, and Limerick.

Typical locations include junctions where turn prohibitions prevent rat-running through residential areas, intersections where turn lanes would create excessive congestion or safety hazards, and points where traffic flow management requires vehicles to continue straight to reach designated turn points elsewhere.

You'll encounter these in city center one-way systems (Dublin's quays, Cork's South Mall, Galway's city center) where complex routing requires specific movement controls at each junction.

Some locations use time-based restrictions (straight-ahead only during peak hours, turns permitted off-peak).

Bus priority corridors often feature these signs preventing general traffic turns that would conflict with bus movements.

Sign placement occurs at or immediately before the junction, often supplemented by road markings (straight-ahead arrows in lanes).

This mandatory sign prohibits left and right turns at the junction, requiring all traffic to proceed straight ahead.

The circular blue sign with white upward arrow indicates compulsory straight movement—drivers cannot choose to turn based on preference or convenience.

Common reasons for straight-ahead mandates include: preventing rat-running (turns would enable shortcuts through residential areas), managing traffic flow (concentrating turns at signal-controlled junctions while keeping other junctions flowing), bus priority (preventing turns that conflict with bus lanes), and safety (turn movements would create unacceptable collision risks).

Drivers intending to turn must plan alternative routes using permitted turn points, often requiring proceeding straight to the next junction with turn permissions.

The mandatory nature means violations constitute regulatory offenses even if turn movements appear physically possible and safe—the sign prohibits turns regardless of apparent conditions.

Violating Keep Straight Ahead mandates by making prohibited turns results in fixed penalties (€80, 2 penalty points) for failing to comply with mandatory traffic signs.

Prohibited turns creating dangerous situations (entering bus lanes, one-way streets wrong way, or conflicting with priority traffic) may constitute dangerous driving (€5,000, 5 penalty points, disqualification).

Many Keep Straight Ahead locations have automated camera enforcement detecting prohibited turns—violations result in postal Fixed Charge Notices with 28-day payment deadlines.

Collisions resulting from prohibited turns typically establish primary liability (80-95%) against violating drivers.

Insurance companies examine mandatory sign compliance—violations establish clear negligence.

Commercial vehicle operators whose drivers violate Keep Straight Ahead signs face operator license reviews if violations indicate poor route planning or driver training.

In urban traffic management zones, repeated violations may result in area access restrictions for persistent offenders.

Theory test questions about mandatory directional signs emphasize understanding that circular blue signs with directional arrows indicate compulsory movements, and that Keep Straight Ahead signs prohibit all turn movements at junctions.

Questions assess understanding of why straight-ahead mandates exist (traffic management, safety, rat-running prevention) and appropriate route planning when encountering turn prohibitions.

Scenario questions test whether candidates recognize that mandatory signs require specific movements regardless of intended destinations—drivers must plan routes using permitted turns elsewhere.

Practical driving tests in urban areas frequently include junctions with Keep Straight Ahead signs; examiners assess: recognition of mandatory signs, compliance with straight-ahead requirements (not attempting prohibited turns), appropriate route planning (knowing alternative routes when original plans involved prohibited turns), and smooth execution proceeding straight without hesitation.

Common faults include attempting prohibited turns despite clear mandatory signs, or excessive hesitation indicating uncertainty about whether the sign applies to your intended movement.