Detour Sign
The detour sign redirects drivers away from the main road to an alternate route because the main road is closed or impassable due to construction, an emergency, or road conditions.
Last updated: April 4, 2026
A detour routes traffic around a closed or impassable section of road. Detour signs are orange and placed at each decision point along the alternate route so drivers can follow the route without navigation devices. The detour may add significant distance to a trip but ensures all traffic reaches its destination safely.
Quick Facts
Type
Temporary Sign
Shape
Rectangular
Colours
Orange background with black text and directional arrow
In this guide
What does the Detour Sign mean?
A detour routes traffic around a closed or impassable section of road. Detour signs are orange and placed at each decision point along the alternate route so drivers can follow the route without navigation devices. The detour may add significant distance to a trip but ensures all traffic reaches its destination safely.
What to do when you see it
Follow detour signs at each turn and intersection. Do not try to find a shortcut that bypasses the detour, as the original road may be closed due to a dangerous condition. Stay on the marked detour route until you see a sign indicating you have re-joined the original route.
Where you'll see it in Ontario
Detour signs appear when major roads are closed for emergency repair, bridge rehabilitation, or construction requiring full road closure. They are placed at the start of the detour and at each turning point throughout.
G1 test relevance
Detour signs are part of the temporary sign colour recognition tested on the G1 exam. Candidates should know that orange means temporary traffic control and that detour instructions must be followed.
Common mistakes drivers make
Following the first detour sign but then attempting to navigate independently and missing subsequent signs is a common mistake that leads to confusion, illegal U-turns, and drivers ending up on the closed road.
Related Signs
Construction Zone Sign
The construction zone sign marks an area where road construction or maintenance work is underway. Reduced speed limits apply, fines are doubled for all offences, and drivers must obey all temporary traffic controls.
Learn moreRoad Work Ahead Sign
The road work ahead sign is an orange diamond sign that gives advance warning of a construction zone ahead. It signals drivers to slow down and prepare for changing road conditions, lane closures, or worker presence.
Learn moreLane Closed Sign
The lane closed sign warns that one or more lanes ahead are closed due to construction or maintenance work. Drivers must merge into the open lane before the closure begins.
Learn moreFlagger Ahead Sign
The flagger ahead sign warns that a traffic control person (flagger) is directing traffic ahead in or near a construction zone. Drivers must obey all flagger directions, which have the same legal authority as traffic signals.
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