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.
Red when any other lamp or any reflector is on the rear or on either side at or near the rear, except as otherwise provided in paragraph (f) of section 39:3-61 for a combination marker lamp; Amber when any other lamp or reflector is on the front or on either side other than at or near the rear.nspection Laws: Amber Reflectors. Want to clear the headlights or install the clear diffusers, but wanted to know if it was illegal in Jersey to do so. So here is an excerpt from NJDMV Inspection standards concerning the front parking lights: 13:20-32.6 Front parking lights; official inspection facilities.