Bumper for vehicles

A bumper for vehicles which is constituted by a hollow tubular frame, which can be closed laterally by means of adapted caps. The hollow tubular frame has, in an upper region and longitudinally, an open cavity which defines a seat for wires. This open cavity can be closed by means of a plurality of covers. A support protrudes from one or more of these covers for a light and/or a registration plate and/or a tail-light.