Conflict With Brake Operation
A bicycle's front brake lever is typically installed on the side of the handlebar closest to the center of the road (front-left for right-side driving.) In many countries, the hand signal for stopping/braking requires that the cyclist signal with the hand used for the front brake.
Cyclists, like all other road users, should be ready to make an emergency stop at all times. When approaching a junction a cyclist may wish to "cover the brake" in readiness for an emergency stop. It is not possible to cover both brakes when performing a hand signal and both hands are needed on the handlebars to steady the bicycle under hard braking. Cyclists therefore sometimes have to choose between giving a hand signal and covering the brake.
Read more about this topic: Hand Signals
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