self-propelled
adj 1: containing within itself the means of propulsion or
movement; "a self-propelled vehicle" [syn: {automotive},
{self-propelled}, {self-propelling}]
2: moved forward by its own force or momentum; "a self-propelled
egotist"; "the arms program is now self-propelled" [syn:
{self-propelled}, {self-propelling}]