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The Permit Test
Slippery When Wet (MUTCD W8-5 sign)

Slippery When Wet

warning sign · diamond · yellow

The pavement ahead is unusually slick when wet. Slow down and avoid sudden moves.

Visual breakdown
Yellow diamond showing a car with wavy skid lines behind it.
Shape recognition
Diamond with a skidding-car pictograph — the wavy lines are the giveaway.
Color recognition
Yellow = hazard; this one activates mainly in rain, frost, or the first minutes of drizzle.
Memory trick
Wavy lines = the road dances when wet. Don't dance with it — slow, smooth, steady.
Real-world example
A polished bridge deck ices before the road does; this sign before a bridge means ease off well in advance in cold rain.
Common mistakes
Braking hard on the slick surface itself. Slow before the hazard, then steer gently through it.
Quick recall method
Skidding car = slick surface; smooth inputs only.