Traffic Signs and Signals
Reading Signs by Shape and Color
Signs communicate through three channels: shape, color, and symbol. Shapes are your fastest cue because they stay recognizable when faded, snow-covered, or seen at a distance. An octagon is always STOP. An inverted triangle is always YIELD. A diamond warns of a condition ahead. A pennant (triangle pointing right) warns of a no-passing zone. A vertical rectangle carries regulatory commands (speed limits, lane use), while a horizontal rectangle gives guidance (route markers, destinations).
Color reinforces meaning: red means stop or prohibit, white means regulatory, yellow means warning, orange means construction or work zone, fluorescent yellow-green means pedestrians and school zones, and blue and brown are guide and recreational signs.
Signals and Traffic Controls
A steady red means stop and remain stopped until green. A steady yellow warns that red is coming - if you can stop safely, do so; do not accelerate to beat it. A flashing red is treated as a stop sign, and a flashing yellow means proceed with caution. A green arrow gives a protected turn, but only in the direction shown. Dark signals at an intersection revert to the right-of-way rules for uncontrolled intersections.
Traps to Watch
Questions love the near-misses: confusing a warning diamond with a regulatory rectangle, assuming a flashing yellow means stop, or assuming a green light always means you may proceed without yielding (you still must yield to pedestrians and clear the intersection). Railway advance-warning signs (round yellow) appear well before the crossing itself.
Rule of Thumb
Ask: What shape? What color? What does it force me to do? An octagon always forces a full stop; a diamond never does - it only warns.