They are not allowed to circulate on the average weekday, down from 20% when the program was launched. As of 2008, only vehicles under 9 years old are allowed to receive the 0 or 00 sticker. Only locally plated vehicles may receive a 2 sticker. Emergency services, solar or electric vehicles, government and school buses are also exempt. There is under the law a special exemption for vehicles, regardless of model year, for handicapped individuals. This also includes handicapped individuals with handicapped plates not from the Federal District or the State of Mexico. Diplomatic vehicles are also exempt. Vehicles that are 30 years or older can apply for an auto antiguo (antique) license plate, that exempts them from emissions testing and hoy no circula restrictions. This requires an inspection of the vehicle by local authorities and a large fee to be paid (currently around $1000 USD) in order to receive these plates. Motorcycles are currently exempt. However, those traveling by motorcycle through the metropolitan area should keep in mind that traffic laws (unrelated to hoy no circula) prohibit motorcycles to travel on expressways and therefore they must use side roads, streets, avenues, etc.