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Left Foot Gas Pedal. The (LFA) was designed for the driver that has lost control of only his right foot, with an (LFA) accelerator installed to the left of the brake pedal the problem of applying the gas is no longer a problem.
In simple terms, when you push the gas pedal down in a gasoline powered vehicle, you open the throttle or intake valve and increase your speed. When you release the gas pedal, close the intake valve or throttle back, you slow down [source: Nice ]. When you go downhill, you let off the gas and press the brake. If the hill is steep, you might even shift into a lower gear to help you slow down and avoid riding the brakes. Â­In semitrailers, letting off the gas doesn't slow the rig the same way it slows a passenger vehicle.