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DIY reverse cruise control would be possible, but probably a lot more work than just keeping an eye on your speed or using cruise control.
Anyways, this is how it could work. You'll need an arduino or other programmable microcontroller to read the vehicle speed sensor, and intercept the gas pedal position sensor. Allow a direct pass through signal for the pedal position sensor for everything until speed exceeds X, then start modifying the output signal of the gas pedal position sensor to limit max speed.
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