Signal Ahead Sign — Meaning
- Category
- Warning
- Shape
- Diamond
- Colors
- Yellow, Black, Red, Green
- Text
- (traffic signal symbol)
- MUTCD Code
- W3-3
What does the Signal Ahead Sign mean?
The Signal Ahead sign is a yellow diamond showing a traffic signal symbol with red, yellow, and green dots. It warns drivers that a traffic signal is approaching, typically where the signal may be obscured or where a signal exists in an unexpected location.
-
1
Reduce speed and prepare to stop if the signal is red
-
2
Watch the signal status as you approach
-
3
Be prepared for sudden lane changes by other drivers
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4
Note the signal sequence (red → green → yellow → red)
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Approaching signals after long uncontrolled stretches -
Where the signal is hidden by hills, curves, or vegetation -
On high-speed approach roads -
After construction or detour periods
A flashing yellow signal means slow down and proceed with caution. A flashing red signal means stop completely (treat like a Stop sign), then proceed when clear. Both can appear at the signal you are approaching.
Should I stop at the Signal Ahead sign?
What if the traffic signal is green when I see the Signal Ahead sign?
Why post a Signal Ahead sign before a traffic light?
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