other countries require bikes sold with lights, cheap dynamo systems abound in Germany for instance.
how would bicycle manufacture be regulated by the DOT anyway and what would bikes then look like?
Hydraulic disc brakes and handlebar airbags wrapped in a unibody safety cage with a 12v lighting system and turn signals?
It's not such a conspiracy to have bicycles regulated by the consumer product safety commission.
The CPSC had recently scheduled to overhaul bicycle safety standards due to the prevalence of carbon fiber in bikes and component manufacture, not sure if they've made final recommendations yet.