Except where angle parking is specifically allowed and indicated by curb or street marking or sign-posting, or all or any of them, each vehicle stopped or parked upon a two-way road where there is an adjacent curb shall be stopped or parked with the right-hand wheels of the vehicle parallel with, and within 12 inches of, the right-hand curb and, where painted markings appear on the curb or the street, the vehicle shall be within the markings, front and rear; provided that, upon a one-way roadway all vehicles shall be so parked, except that the left-hand wheels of the vehicle may be parallel with and within 12 inches from the left-hand curb, but the front of the vehicle in any event and with respect to the remainder of the vehicle, shall be in the direction of the flow of traffic upon the one-way street; and it is unlawful to park in violation of this section.