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|Maintained by Roadways SR|
Formerly Highway 20, Highway 20B, B1 and A2
|Length||81 m (265 ft)|
|Existed||November 2010 – present|
|Direction||Northwest - Southeast|
|North end:||/ A1/PH20 at North Alston|
A2 at Belmont
PH15 at Belmont
|South end||A1/A2 at Alston|
|Primary destinations||North Alston, Belmont, Gardenia, Alston|
The Alston Motorway (historically known as the Northern Motorway) is a motorway in Cambria, Sirocco. It links the provincial capital, Alston, to its northern suburbs and the northern end of the province. It is part of the A1. The highway is identified on signage and maps with the standard green and orange box with M1 in orange type.
The Alston Motorway starts in North Alston at the Northern Interchange, which it shares with the Rockport Highway. Initially it is a gravel road, but after seven metres becomes a fully concreted road. From here it is a smooth descent into Belmont, where it again becomes a gravel road at the Belmont Interchange. The motorway continues further southeast until it reaches its terminus at the intersection with Commonwealth Avenue and Hibiscus Street.
The Alston Motorway has one of the highest speed limits in Sirocco at 30 km/h for its entire length.
|Territorial authority||Location||Exit number
|Former exit number
|Alston City||North Alston||750||122||A1 Rockport Highway — Islington, Ackland District, Rockport, Port Ackland, Ballmore, Shelly Bay|
|PH20 Glorious Highway — Maran District, Kingdom Bay|
|743||115||North Alston Road — Islington, Snell Cliffs||Beginning of concrete surface|
|740||112||North Alston Postal Centre|
|721||93||Residential access||Southbound entrance and exit only|
|717||89||North Alston Service Centre||Northbound entrance and exit only|
|682||54A/B||Bridge Street — Gardenia|
|A2 Matauri Road — Belmont, Matauri||End of concrete surface|
|680||52||PH15 Ronda Street — Gardenia, Tent Pegs||Southbound entrance and exit only|
Exit previously known as Rhonda Street until 23 February 2013
|Gardenia||673||45||Hereford Street — Gardenia||Southbound exit only|
|Alston||669||41||A1 Hibiscus Street — Tara Corner, Tent Pegs, Gate Park|
|A2 Commonwealth Avenue — City Centre, Matauri|