From Roader's Digest: The SABRE Wiki
Route
The northern half of this formed part of the North Circular Road, until the 1980s when the South Woodford to Barking Relief Road opened as far as the A13.
Plaistow - Whipps Cross
It starts at Whipps Cross Roundabout with the A104 (part of which was also part of the NCR), and heads southeast towards the Green Man roundabout in Leytonstone. Before the A12 was extended towards Hackney Wick (with an underpass beneath the roundabout) the A114 had exits both north and south, but in 1999, the southern exit was redirected slightly westward to debouche onto the A11 Leytonstone High Road, so traffic has to turn onto the A11 to head south. Bush Road carries southbound A114 traffic in am eastward arc, until it reaches the junction with Blake Hall Road. It turns right (left was the old A1008, ahead the unclassified Overton Drive), and then due south. The A116, quickly diverging southeastward at a roundabout on Wanstead Flats, carried the NCR tag in olden days, so the A114 south of here has always been non-primary. It crosses the Flats as Centre Road, and then as Woodgrange Road goes under the Barking - Gospel Oak railway, then rapidly over the GER at Forest Gate, and crosses the A118. As Upton Lane, it continues southward, with a bit of a west then south kink between St. Georges Road and West Ham Park Road, then it crosses the District Line/London-Tilbury Line just east of Plaistow, and almost immediately coming to a halt at the A112 Plaistow High Street traffic lights.
{{Original Author|Sunil Prasannan}