Gauging the speed of a motorcycle may be difficult because:

Motorcycles often slow down by downshifting.
Motorcycles are slower than cars.
Many motorcyclists do not activate the brake light.
Motorcycles take up less of your field of vision.
Explanation

It is difficult to gauge the speed of motorcycles because they take up less field of vision than larger vehicles. Their small dimensions interfere with our depth perception, causing us to think that a motorcyclist is farther away than they actually are.

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