On sunny days everyone washes their car and the water runs across the road. On rainy days the road is wet anyway. On a dull, dry day nobody bothers, and the corner is dry.
A man rides his motorbike to work the same way every day. There is one corner he takes slowly when it is sunny and slowly when it is raining, but fast when it is cloudy and dry. Why?
Give me a hintThe hint
What is on that corner?
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There is a car wash on the corner
Source: Traditional, from Jed Hartman’s list of situation puzzles