Police bicycles
Bicycles intended for police bicycle patrol are outfitted with special colored lighting, generally blue and red, to alert the surrounding public of the officer’s presence. These lights can flash in a variety of patterns, sometimes supplemented with a siren, to help the officer make his or her way through crowded streets or sidewalks in case of emergency. A popular method of supplying power to police bicycle lights is to encase the battery in a bottle-shaped container which can fit into the bicycle’s water bottle holder.