The department may make such regulations as may be required in the interests of public safety governing the use of any express highway or additional facilities constructed as provided in this article for the purpose of loading or unloading of passengers.

Nothing in this article or in this section shall be construed to authorize the operation of any vehicle in violation of any provision of the Vehicle Code or to deprive the Public Utilities Commission of any authority now or hereafter vested in it to regulate public motor carriers of passengers.