a. No motor vehicle shall be accepted by a licensee for parking, or storage, in excess of the capacity of the garage or parking lot, as shown in the license. Whenever the maximum capacity of a garage or parking lot has been reached, the licensee shall post, at the public entrance thereof, a sign, composed of letters of such size, height, width, spacing, color and description as shall be prescribed by the rules and regulations of the commissioner, stating that such maximum capacity has been reached.
b. Vehicles shall be stored or parked on the licensed premises in such manner as shall be prescribed by the rules and regulations of the commissioner, for the purpose of safeguarding persons and property and permitting adequate inspection of the premises.