(a) The Commissioner of Transportation adopts part 391 of title 49 of the Code of Federal Regulations (CFR) with the same force and effect as though herein fully set forth at length with respect to drivers of commercial motor vehicles, as herein defined operating in interstate or foreign commerce. (b) The Commissioner of Transportation adopts 49 CFR part 391 with the same force and effect as though herein fully set forth at length with respect to drivers operating solely in intrastate commerce operating