A509 road

The A509 is a short A-class road (around 30 miles (48 km) long) for north-south journeys in south central England, forming the route from Kettering in Northamptonshire to the M1 and A5 in Milton Keynes.

A509
Major junctions
North end	Kettering 52.3880°N 0.7147°W / 52.3880; -0.7147 (A509 road (northern end))
	A14 A45 A428 A422 M1 A4146 A5
South end	Milton Keynes 52.0374°N 0.7819°W / 52.0374; -0.7819 (A509 road (southern end))
Location
Primary destinations	Kettering, Wellingborough, Milton Keynes
Road network
Roads in the United Kingdom Motorways A and B road zones

From north to south, the road begins at Wicksteed Park in the outskirts of Kettering. It then crosses the A14 (where it becomes a primary route) and goes through Isham and Great Harrowden. After this it goes on to form the Wellingborough western bypass before leaving Northamptonshire to cross into the Borough of Milton Keynes (ceremonial Buckinghamshire). From there, it crosses the A428 at a roundabout and cuts through the centre of Olney. South of Olney the road passes Emberton, meeting the A422 just east of Newport Pagnell, where the routes multiplex to form the Newport Pagnell eastern bypass. South of Newport Pagnell, the routes diverge at a roundabout with the A509 turning south and the A422 continuing westbound. Here the A509 is a single carriageway once more until it crosses the M1 at Junction 14, where it enters Milton Keynes proper and multiplexes for a short distance with the A4146 (on separating, the latter takes over the 'primary route' designation and the A509 loses it). Once more a dual carriageway, it runs for a further 4 miles (6.4 km) past the edge of Central Milton Keynes (the central business district) and the Network Rail National Centre ('Quadrant:MK'), to link up finally with the A5. Through Milton Keynes the road is known as the H5 Portway.