Mutagen vs Carcinogen Mutagen and carcinogen are two terms that have a lot in common. There is a potential that a single substance could be both of them at the same time and be only one of the two, as well.
A curb bit is a type of bit used for riding horses that uses lever action. It includes the pelham bit and the Weymouth curb along with the traditional curb bit used mainly by Western riders. Kimblewicks or Kimberwickes are modified curb bits, and a curb bit is used in a double bridle along with a bradoon.
Curb extension is an umbrella term that encompasses several different treatments and applications. 1  Midblock curb extensions, known as pinchpoints or chokers, which may include cut-throughs for bicyclists. 2  Curb extensions used as gateways to minor streets known as neckdowns. Offset curb extensions that force vehicles to move laterally, known as chicanes. Curb extensions at bus (or transit) stops, also known as bus bulbs. Conventional curb extensions, which are a recommended feature where there is on-street parking.