Traffic Signal Ahead Sign
The traffic signal ahead sign warns that a traffic light is located just ahead, typically where it is not easily visible from a distance due to terrain, curves, or sight line restrictions.
Last updated: April 4, 2026
This diamond warning sign is placed where an upcoming traffic signal might be difficult to see until the driver is very close to it. It gives drivers advance notice so they can reduce speed and be ready to stop if the light is red by the time they arrive. It is commonly placed near the crest of a hill or after a curve where the intersection is hidden.
Quick Facts
Type
Warning Sign
Shape
Diamond
Colours
Yellow background with black traffic light symbol
In this guide
What does the Traffic Signal Ahead Sign mean?
This diamond warning sign is placed where an upcoming traffic signal might be difficult to see until the driver is very close to it. It gives drivers advance notice so they can reduce speed and be ready to stop if the light is red by the time they arrive. It is commonly placed near the crest of a hill or after a curve where the intersection is hidden.
What to do when you see it
Reduce speed and be prepared to stop at the signal ahead. Do not assume the light will be green when you arrive. Cover the brake pedal as you approach in case the light is red or changes from green to amber.
Where you'll see it in Ontario
Traffic signal ahead signs are placed where signals are located beyond a crest, curve, or at the bottom of a hill where visibility to the signal is limited. They are also used on rural roads where a signal is unexpected and drivers at highway speed may not see it in time.
G1 test relevance
This sign tests whether candidates understand that warning signs anticipate road conditions ahead. The appropriate response is to reduce speed and prepare for a possible stop, not to continue at full speed.
Common mistakes drivers make
Approaching at full speed because the light appears green from the warning sign distance is risky. Lights can change before you arrive. The sign is there precisely because the signal is not clearly visible from far away.
Related Signs
Intersection Ahead Sign
The intersection ahead sign warns that a cross street or side road is coming up. It is placed where the intersection is not clearly visible in advance, such as on a hill or after a curve.
Learn moreStop Sign
The stop sign is a red octagonal sign with white lettering that requires all drivers to come to a complete stop at the marked stop line, crosswalk, or before entering the intersection. Rolling stops are illegal in Ontario.
Learn moreYield Sign
The yield sign is a downward-pointing triangle that requires drivers to slow down and give the right-of-way to traffic already in the intersection or roadway. You must stop if necessary, but you do not have to stop if the way is clear.
Learn moreCurve Ahead Sign
The curve ahead sign warns drivers of a gradual curve in the road ahead. Drivers should reduce speed before entering the curve, not during it, to maintain control and stay in their lane.
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