and Rouse Hill. Contract regions Most services are provided under a service contract between the operator and Transport for NSW. There are 14 contract regions, each of which is tied to a geographical area. Routes B1 Mona Vale to Sydney CBD This is a limited stops route operating in the Northern Beaches region of Sydney. It is operated with a dedicated fleet of double deck buses. T80 Liverpool to Parramatta This is a bus rapid transit route operating in the south western part of Sydney, mostly along dedicated bus-only roads. North-West T-way A variety of routes operate along various sections of this T-Way, including some express services to the CBD. Metrobus routes Metrobus routes operate in various parts of Sydney. The original Metrobus routes run along major inner city corridors, passing through the Sydney central business district without terminating there. Later routes operate in areas further out from the city centre, connecting major suburban precincts. Metrobus routes are increasingly being debranded into normal routes, with many routes having now lost the M prefix, in case of confusion with metro services. Other routes Many other routes operate throughout Sydney. Most of these routes are classified with three-digit route numbers based on the area of the city they operate in: 100 series – Northern Beaches 200 series – Northern Districts and North Shore 300 series – Eastern Suburbs 400 series – Inner West and Southern Suburbs 500 series – North West 600 series – Western Suburbs and Hills District (T-way) 700 series – Outer Western Suburbs and Hills District (T-way) 800 series – Outer South-Western Suburbs 900 series – St George/Sutherland and South West Special services are denoted by letter prefixes in their route number: M - Metrobus services (all but three M routes have been renumbered into normal 3-digit numbers as of January 2021) B - B-Line services BN - B-Line overnight services X – Express service used by State Transit (region 9) L – Limited Stops service (used by State Transit (regions 9). Other Limited Stops routes use normal three-digit numbers with or without an X suffix) T – Services operating, at least for the most part, via a T-Way (only T80 left with those operating on the North-West T-way having been renumbered into normal 3-digit numbers in 2019) S – "Shopper Hopper" route (used for some private operators' routes that typically run between morning and afternoon peaks, Monday-Friday only)