Abstract: A road excavator is a drivable vehicle equipped with an excavating apparatus which has a rotary cutter for excavating a paved highway surface, first and second conveyors for exporting an excavated material outside of the excavator, a collector which is placed between the cutter and the first conveyor for gathering the material as much as possible. The collector has a casing having a discharge port at the center thereof for receiving the excavated material and a helical screw, incorporated within the casing, having two sets of spiral blades for gathering the excavated material toward a discharge port and expellers for expelling the material forcibly to the first conveyor through the opening according to the rotation of the screw.