It was a busy morning in the city. A pedestrian was crossing the street at the crosswalk when a cyclist failed to stop at the traffic signal. Luckily, a police officer was nearby and intervened, reminding the cyclist to always follow traffic signs and signals. The cyclist had to show his documents, including his bike registration. Meanwhile, an ambulance sped by with its sirens on, and all vehicles had to pull over to let it pass. The officer also noticed that the cyclist wasn't wearing a helmet and reminded him of the importance of safety gear.
What should a cyclist always wear while riding?