SAFE VEHICLE SPEED LIMITER

An intelligent speed adaptor (ISA) system includes a pedal interface configured to receive accelerator pedal sensor (APS) signals output from a pedal sensor and provide the output APS signals to an engine control module (ECM). The system is configured to modify the output APS signals by changing an indicated position of the accelerator pedal before being provided to the ECM, whereby the ISM system limits the speed of the vehicle to an allowed speed that is determined by the ISA system. Preferably, the pedal interface includes a first signal-processing circuit for modifying digital APS signals and a second signal-processing circuit for modifying analog APS signals and is configured to detect whether an APS signal is digital or analog and profile ranges of pedal movement. The system further includes a signal generator for generating reference signals for calibration; and a mechanical relay for bypassing the pedal interface.