Each E-ZPass tag is specifically programmed for a particular class of vehicle; while any valid working tag will be read and accepted in any E‑ZPass toll lane, the wrong toll amount will be charged if the tag's programmed vehicle class does not match the vehicle. This will result in a violation and possible large fine assessed to the tag holder, especially if a lower-class (e.g., passenger car) tag is being used in a higher-class vehicle such as a bus or truck. In an attempt to avoid this, E‑ZPass tags for commercial vehicles are blue in color, contrasting with the white tags assigned to standard passenger vehicles. The blue E‑ZPass is also used in government employee vehicles. In New York, an orange E‑ZPass tag is issued to emergency vehicles as well as to employees of the Metropolitan Transportation Authority, Port Authority of New York and New Jersey, and New York State Thruway Authority. New York also offers green-colored E-ZPass tags (and a 10% toll discount plan) to qualifying low-emission and zero-emission vehicles.