Fixies are bicycles with a drive train fixed to the rear wheel and always engaged. This system allows the bike to be pedalled backward, for example. These bikes can be stopped by blocking the rear wheel but they cannot stop quickly. They slow down gradually.
Fixies are considered legal as long as it has another braking system, in compliance with paragraph 247 of the Highway Safety Code, which stipulates that bicycles must be equipped with at least one brake system that acts on the rear wheel.
Riding a fixed-gear bicycle that does not have rear-wheel brakes activated by levers on the handlebars or directly by the pedals, is an infraction that leads to a $15 fine (plus applicable fees).