Abstract: The present disclosure relates to accelerator type crash simulation test systems. These systems provide repeatable and reliable simulation of vehicle frontal impact crash events. The crash simulation test systems are capable of simulating motion in the form of rotation about a vertical Z-axis and/or translation in a direction perpendicular to the motion of the ServoSled. The combination of these motions is generally known as yaw. Yaw motion is of particular interest in frontal crash events in which the center of impact is offset from the center of the vehicle. The yaw motion can be achieved, for example, in several embodiments by the use of off-board actuators that supply yawing motions to an onboard platform.