A crevasse is a deep crack, or fracture, found in an ice sheet or glacier, as opposed to a crevice that forms in rock. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pieces above a plastic substrate have different rates of movement. The resulting intensity of the shear stress causes a breakage along the faces.
Unfortunately, many cyclists choose to ride their bikes at dark without bicycle head lights or tail lights. This is against the law in most states in the U.S. (Amazingly, Washington, Texas, and others only require a head light and rear reflector.) It is also very dangerous.here are at least two primary reasons for you, a bicycle rider, to use lights at night. 1  First, the front head light illuminates the area in front of you, so you can ride safely, by being able to detect any hazards you approach.
A. Yes. Rule 66 of the Highway Code states that cyclists should never ride more than two abreast and ride in single file on narrow or busy roads and when riding around bends. It is perfectly legal for cyclists to ride side by side on most roads. lot of cyclists take the view that undertaking traffic on the nearside is the more dangerous option as it puts you in a position where you cannot easily be seen and the drivers of vehicles do not expect bicycles to âundertakeâ them. You also run the risk of a passenger in a vehicle opening their door into your path.