The Eastern Express Highway, abbreviated to EEH, is a 23.55 km (14.63 mi) city express highway serving the cities of Mumbai and Thane. It is one of the busiest and most important roads in the Mumbai Metropolitan Area and is a part of the National Highway 48. It is a north–south artery of Mumbai connecting the city proper to the eastern suburbs and to the metropolitan area of Thane. For most of its course, it is 6 lanes wide with over a dozen flyovers/grade separators.