The A1309 is a short road (1.9 miles) which links the two ends of the A10 to north and south of Cambridge

Cambridge

The city of Cambridge is a university town and the administrative centre of the county of Cambridgeshire, England. It lies in East Anglia about north of London. Cambridge is at the heart of the high-technology centre known as Silicon Fen – a play on Silicon Valley and the fens surrounding the...

 city centre in Cambridgeshire

Cambridgeshire

Cambridgeshire is a county in England, bordering Lincolnshire to the north, Norfolk to the northeast, Suffolk to the east, Essex and Hertfordshire to the south, and Bedfordshire and Northamptonshire to the west...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

. It was numbered as part of the A10 prior to the construction of the Cambridge Western Bypass (now M11) and the Northern Bypass (originally A45

A45 road

The A45 is a major road in England. It runs east from Birmingham past the National Exhibition Centre and the M42, then bypasses Coventry and Rugby, where it briefly merges with the M45 until it continues to Daventry...

, now A14).

Its northern end is at the Milton

Milton, Cambridgeshire

Milton is a village just north of Cambridge, England. It has a population of approximately 4,300 with 3,200 being on the electoral register. It expanded considerably in the late 1980s when two large housing estates were built between the bypass and the village resulting in a doubling of the...

 Interchange with the A14 and A10. From here, it passes the Cambridge Science Park

Cambridge Science Park

The Cambridge Science Park, founded by Trinity College in 1970, is the oldest science park in the United Kingdom. It is a concentration of science and technology related businesses, and has strong links with the nearby University of Cambridge....

, the Cambridge Business Park

Cambridge Business Park

Cambridge Business Park is a large business complex in Cambridge, England. It is home to many companies, mostly IT-related, such as CSR, Autonomy, MathWorks and Red Gate Software, but also intellectual property firms such as Mewburn Ellis, Venner Shipley and Mathys and Squire....

, and the Cowley Road Park & Ride site, as Milton Road on its way to the Mitchams Corner gyratory complex just to the north of the city centre.

It is unmarked through the city centre, but reappears to the south on the route of the A1134 ring road named Trumpington Road

Trumpington Road

Trumpington Road is an arterial road in southeast central Cambridge, England. It runs between the junction of Trumpington Street and Lensfield Road at the northern end to the junction of the High Street in the village of Trumpington and Long Street at the southern end...

which then becomes Trumpington High Street. In Trumpington

Trumpington, Cambridgeshire

Trumpington is a village within the city of Cambridge, UK, of which it is a suburb. It is located on the south-west side of the city and borders Cherry Hinton to the east, Grantchester to the west and Great Shelford and Little Shelford to the south-east....

, it has a junction with the A1301 and then passes the Trumpington Park & Ride site before its southern end at junction 11 of the M11 motorway

M11 motorway

The M11 motorway in England is a major road running approximately north from the North Circular Road in South Woodford in north-east London to the A14, north-west of Cambridge.-Route:...

and the A10.