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.
Radar laser detectors and laser jammers are legal to own and operate in passenger vehicles in the state of New York.   Currently the only state that it is illegal to operat â¦ e a radar detector is Virginia and Washington D.C.eadlamps originally designed, built, tested, and certified as HID headlamps are legal in all 50 states. So-called HID kits to convert halogen headlamps are widely available â¦ , but they are (all) illegal and dangerous; halogen headlamps must use halogen bulbs.