Luxembourg City is served by 163 of its own AVL (Autobus de la Ville de Luxembourg) buses transporting some 28 million passengers per year (2007). As with the RGTR, AVL contracts out to private operators for a number of services. Most of these buses are in AVL colors but the owner's name is often mentioned on them in small print. Also, the letters on the license plate can give ownership away to those that know how that system works. There are 25 regular bus routes plus special bus services through the night.