A bullbar or push bumper (also (kanga)roo bar, winch bar or nudge bar in Australia, livestock stop (initially a term used to refer to locomotive pilots) or kangaroo device in Russia, and push bar, ram bar, brush guard, grille guard, cactus pusher, rammer, PIT bar, PIT bumper, or cattle pusher in the United States and Canada) is a device installed on the front of a vehicle to protect its front from collisions, whether an accidental collision with a large animal in rural roads, or an intentional collision by police with another vehicle. They range considerably in size and form, and are normally composed of welded steel or aluminium tubing, or, more recently, moulded polycarbonate and polyethylene materials. The "bull" in the name refers to cattle, which in rural areas sometimes roam onto rural roads and highways.