A. power steering allows a vehicle to be easily steered at low speeds.
B. on many late-model vehicles, the speed of the vehicle determines how much power assist is given.
C. maximum power assist occurs at 150 rpm (fast idle) while the vehicle is at rest.
D. General Motors' electronic variable assist steering system, Magnasteer, has a rotary actuator attached to the input shaft of the hydraulically powered rack and pinion steering gear.