(a) Notwithstanding any other provision in this Part, every single-unit motor vehicle registered in this State, operated for commercial purposes and having a cube style or enclosed walk-in delivery bay, where such delivery bay has a length of eight feet six inches or more, but not exceeding a length of 18 feet, or every sani-van and motor vehicle commonly classified as a garbage truck purchased on or after January 1, 2008 and registered in New York State, which is operated in and engages in the collection of garbage or refuse in the county of Westchester shall be equipped with a cross-view back-up mirror system, rear video system, or rear object detection system. The provisions of this section shall not apply to motor vehicles commonly classified as rolloff vehicles that are used for the express purpose of transporting waste containers such as open boxes or compactors.

1. (1) Cross-view back-up mirror system means a mirror(s) which, when mounted will allow the driver of a truck to view a minimum distance of six feet to the rear and encompass the width of the rear of the vehicle in order to be able to detect an object or person.
2. (2) Rear video system means a device installed on a truck which will allow the driver to view on a video monitor mounted inside the cab, a minimum distance of six feet to the rear and encompass the width of the rear of the vehicle in order to detect a person or object.
3. (3) Rear object detection system or other device means a device installed on a truck which will alert the driver by means of a visual and audible warning indicator inside the cab, of a person or object within a minimum distance of six feet to the rear and encompass the width of the rear of the vehicle.
4. (4) Enclosed walk-in delivery bay means a compartment in a vehicle used for storing or transporting cargo which is accessible from the driver's compartment and/or the rear of the cargo area and/or the side of the cargo area.