The ability to ride safely in a group is one of the most important skills in cycling. Not only is it an effective way to cover a lot of ground and battle the elements, but you conserve energy, it’s social, and it’s fun!
More times than not you will be sharing the scenic roads of Colorado with other cyclists, motor vehicles and local community members so stay alert and practice riding with others using these skills:
10 basic cycling hand signals to keep you — and those around you — safe out on the road.
Pacelines are either single or double. In a single paceline, everyone lines up single file behind the first rider, who maintains a consistent speed. Rotation occurs when the front rider pulls off to the side and eases to the back of the line. The next rider will then set the pace. Riders stay on the front for a few seconds to several minutes. This type of paceline has the advantage or requiring less road space while conserving energy.
A double echelon, also known as a rotating paceline, contains two lines of riders side by side, continuously in motion. One line goes slightly faster than the other does. Let’s say you’re the lead rider in the faster line. You should cross-over to the slow line after passing the front wheel of the rider beside you (the front rider in the slower line). Then you drift back with the others in the slow line. When the final position is reached (back of the line), move onto the back wheel of the last rider in the fast line.
On your (Left/Right)
"On Your Left!" (or Right) before passing another cyclist or pedestrian
(You name it) Up or Back
"Rider Up!" when a rider is approaching or there is a rider ahead you will pass soon.
"Rider Back!" when a rider approaching from behind will pass the group soon.
"Walker Up!" when there is pedestrian ahead you will overtake soon.
"Car Up!" or "Car Back!" to announce an approaching vehicle.
"Car Right!", or "Car Left!" when a vehicle is approaching from the side.
Slowing / Stopping
"Slowing!" or "Stopping!"; if you are going to be quickly decelerating. This should be accompanied by a hand signal, if practicable.
Rolling
“Rolling!” or "Going!" to announce you will be proceeding through an intersection.
Clear
Do not announce "Clear!" at intersections as it only encourages illegal and risky behavior (such as running stop signs or red lights). Each rider should determine the safety of proceeding using their own best judgement.
Outside Link
Bicycle Safety For Kids by Bachus Shanker law firm