Here comes the Wee-Woo man
I really doubt that could stop them... Ever heard of interstate commerce? Its pretty much the Feds way into regulating anything. They could create a Federal highway patrol quite easily in the "interest" of protecting interstate commerce. They could easily empower their highway rangers to enforce any and all federal and state laws. Never say it isn't possible... Its the government, it does what it wants...There are no national federal highway laws. Federal law enforcement is limited to federal laws or property and typically the applicable code of federal regulations (CFRs) that apply to that agency or its purview. Way too far outside the scope of any existing federal agencies. Feds have broad authority but narrow scope for a reason.