

In addition to this, the voltage drop from one end of the wire to the other would probably make a 5V input useless to begin with when you only get 1.5V out on the other end. Higher input voltage doesn’t suffer quite as badly while also helping to keep the current low like you mentioned.
These people might be two-footed drivers. My mother used to do this and you’d see the brakes flash on and off while following behind her because she’d be hovering her foot on the brake pedal while also hitting the accelerator.