|Location Map ( geo)|
|M3, A308, A316|
|Junctions related to the A308|
Sunbury Cross is junction 1 of the M3.
|The SOUTH WEST, (M25)|
|Kingston, Kempton Park|
|C. London, Richmond, Heathrow Airport, Feltham|
|Sunbury Station||no through road. Station Road|
|Lower Sunbury||7.5 Ton weight limit. Green Street. Direct, albeit unsigned, route to Shepperton and Walton Bridge.|
|Feltham Young Offenders Establishment||Vicarage Road|
|London, Richmond, Feltham|
|The NORTH, The WEST (M4, M40, M1), Heathrow Airport, Uxbridge, Hounslow|
|(A3, A24, A23), Kingston, Sutton, Croydon|
Originally a five-way junction at the southern end of the A305, on the A308, Sunbury Cross has been proposed as the beginning of a new radial out of London since the 1920s (though, admittedly, the A305 was planned to be bypassed further in by the New Chertsey Road and upgraded through Hanworth).
In the 1930s, plans continued for a route to head South East from here, joined by a new plan for a route to terminate on that route just to the west of Sunbury Cross.
In the early 1960s, the route to the South West had become the M3, and the route to the north was planned to become a motorway too and extended south east from the junction towards Croydon. The proposed junction would consist of two roundabouts with slip roads alongside the M3 joining the two.
By 1966, it was recognised there would be a lot of turning traffic between the two motorways and therefore a freeflow design with west facing turns only for Ringway 3 was recommended. There would be no access to the M3 for local traffic.
An alternative to the above allows all movements to be provided at a large roundabout.
It should be noted that no final layout appears to be have chosen before the Ringway 3 plans were abandoned after 1973. The eastern of the two roundabouts was built as planned when the M3 opened in 1974 which by default leaves provision for the R3 component to be added later.