A boom barrier or a boom gate is used primarily to block vehicles and pedestrians from moving into a controlled zone. Boom barriers come with a bar and counterweights to block traffic at both ends. Currently automatic boom barriers are used due to their reliability and low heat generation. Boom barriers are used extensively at level crossings, checkpoints, parking areas, toll booths and prohibited areas. One of the important uses of boom barriers is to control traffic. Other usages include handling emergency transportation and making space for clearer route.