Beginner Driver Education · Rules of the Road
Understanding Warning Signs on the Road
Driviology Road Safety Education Team
What this actually means for you
Warning signs are the road talking to you in advance: a narrow bridge, a sharp curve, a roundabout, an intersection where the other road has the right of way. They are almost always diamond-shaped and yellow in Ontario, and they share one message — something ahead needs you slower, more attentive, or both.
Warning Signs - Rules of the Road
Warning Signs
Narrow bridge ahead.
Road branching off ahead.
Intersection ahead. The arrow shows which direction of traffic has the right-of-way.
Roundabout Ahead. Reduce Speed. The counter-clockwise arrows show the direction of vehicle traffic within the roundabout.
Drivers on the sideroad at the intersection ahead don't have a clear view of traffic.
Pavement narrows ahead.
Slight bend or curve in the road ahead.
Posted under a curve warning, this sign shows the maximum safe speed for the curve.
Sharp bend or turn in the road ahead.
Chevron (arrowhead) signs are posted in groups to guide drivers around sharp curves in the road.
Winding road ahead.
The bridge ahead lifts or swings to let boats pass.
Using this on Ontario roads — and on your road test
You will see these constantly outside the GTA core: winding-road signs on rural routes, chevron arrows marking a sharp curve, bridge and roundabout warnings in smaller Ontario towns. The correct response is a routine: spot the sign, ease off, position the car, and be ready before the hazard itself appears.
Questions drivers ask us
What do warning signs look like in Ontario?
Most are diamond-shaped and yellow (or orange in construction zones), with a black symbol or message warning about the road or traffic condition ahead.
What should I do when I see a warning sign?
Slow down as needed, increase your attention, and adjust your position early — the sign is giving you time, so use it before the hazard, not at it.
Are warning signs on the G1 test?
Yes. Sign recognition — including warning signs and what each one means — is a core part of the Ontario G1 knowledge test.