Construction Signs — 14 Signs to Know

Construction signs are orange instead of yellow — a colour reserved specifically for temporary work zones so they stand out from permanent warning signs. These 14 cover the signs you’re most likely to see approaching and driving through a work zone on a Canadian knowledge test.

Construction Ahead

Warns that a construction zone is ahead, often with a distance shown. Slow down and watch for workers and equipment.

Road Work Ahead

Warns of road work in progress ahead. Reduce speed and be alert for changing conditions.

Lane Closure Ahead

Indicates a lane ahead is closed. Merge safely into the lane that continues through the work zone.

Flagger Ahead

A worker ahead is directing traffic through the work zone. Slow down and follow their signals.

Stop/Slow Paddle Sign

Held by a flagger. The STOP side means stop completely; flipped to SLOW, proceed carefully at reduced speed.

Survey Crew Ahead

Warns that survey workers are on or near the road ahead.

Detour Ahead

Marks a temporary alternate route around a closed section of road.

Diversion Warning

Warns that traffic ahead is being diverted from its normal path, often around construction.

Pavement Ends

Warns that the paved surface ends ahead, often changing to gravel.

Bump Ahead

Warns of a bump or uneven surface ahead, often where construction meets existing pavement.

Uneven Lanes

Warns that adjacent lanes are at different heights — common where old and new pavement meet.

Temporary Signals Ahead

Warns of temporary traffic lights controlling traffic through a work zone.

Do Not Pass When Flashing

Prohibits passing while accompanying lights are flashing — common in single-lane work zones led by a pilot vehicle.

Soft Shoulders

Warns that the road shoulder is soft, often due to recent work, and may not support a vehicle’s weight.