Abstract: A traveling rock crusher has a vehicle body adapted to travel along the ground in a horizontal travel direction, a drum mounted at a front end of the body and rotatable about a horizontal axis generally perpendicular to the direction, an array of radially outwardly projecting chisels mounted on the drum, and a plurality of angularly spaced breaker elements mounted on the drum between the chisels. A support is mounted on the body spaced back in the direction from a rear side of the drum and carries a plurality of vertically spaced breaker bars spaced from the drum. A drive is provided for forcibly rotating the drum about the axis in a sense with a front side of the drum moving upward and the rear portion of the drum moving downward for engaging the chisels and elements with rocks on the ground, picking up the rocks, and comminuting the rocks against the breaker bars.