Federal law caps cars without steering wheels at 2,500 units a year. Tesla is about to mass-produce one with no cap at all. The move is brilliant. Every US vehicle safety standard assumes a human driver. Steering column crash tests. Brake pedal force requirements. A car with no wheel and no pedals normally can't pass, so companies petition NHTSA for an exemption, and the exemption comes with a hard ceiling of 2,500 vehicles per manufacturer per year. Zoox took that route. Amazon's robotaxi…