1. RESTRICTIONS ON RIDING TWO (2) ABREAST. Cyclists can ride two (2) bicycles abreast, so long as they do not impede or disrupt the normal flow of traffic. (C.R.S. 42-4-1412(6)).
  2. USE OF LIGHTS. If riding between sunset and sunrise, a cyclist must use lights. The law requires that a light system for bicycles must, at a minimum, include a white light that is visible from five hundred (500) feet to the front and a red reflector on the rear that is visible from all distances from one hundred (100) feet to six hundred (600) feet when directly in front of lawful low beam headlights. (C.R.S. 42-4-221)
  3. USE OF HAND SIGNALS. A cyclist is required to signal to turn or stop for 100 feet. The hand signals are as follows: a left turn by extending his/her left hand and arm horizontally; a right turn by extending his/her left hand and arm upward, or by extending his/her right hand and arm horizontally; a stop or decrease in speed by extending his/her hand and arm downward. (C.R.S. 42-4-1412(9)).
  4. HELMETS NOT REQUIRED AND CELL PHONES NOT PROHIBITED. As surprising as this is, we do get questions over these issues. There is no law that requires Colorado cyclists to wear helmets or prevents them from talking on cell phones while riding. Hopefully, most cyclists will view this as a common-sense issue despite any formal laws in place.
  5. CARS MUST GIVE THREE (3) FEET OF SPACE WHEN PASSING A BICYCLE. When a Motor Vehicle passes a bicycle, the vehicle must give the cyclist 3 feet of separation between the right side of the vehicle and this includes mirrors and trailers. Also, when a Motor Vehicle passes a bicycle, it must not go back to the right until it is safely clear of the bicycle. (C.R.S. 42-4-1003).