The B902 is a short B-road running north of Falkirk.
The route starts at a roundabout on the A803 relief road in Falkirk town centre and heads north, immediately crossing the railway line by Grahamston station and then continuing through the suburbs to cross over the Forth & Clyde Canal. On the far side an unclassified road heads off right from traffic lights; this goes through an industrial estate to reach the A9.
We, meanwhile, continue on to go over the A9 without a junction and then continue on into Bainsford where we meet the B906, which takes traffic back to the A9. Shortly afterwards we bear right onto a relief road which crosses the River Carron and then goes through the village of that name. The relief road continues north, passing to the east of Stenhousemuir.
After meeting the B905 at a roundabout the B902 continues for another couple of hundred yards to end at a final roundabout on the A88.
An amended OpenStreetMap trace for this route awaits uploading to the SABRE Wiki.
The original route of the B902
What is now the current route was numbered B905 from Falkirk as far as Carron and was then unclassified from there northwards. Although the original incarnation only lasted a few years before being upgraded, it is not known exactly when this version of the B902 came into being. By the 1950s maps show the B902 as an L-shaped road from Carron to Stenhousemuir along Alloa Road and King Street; maps as early as the 1930s show this road but do not give it a number so it is likely the current B902 came into being shortly after the original disappeared.
In more recent years the B902 lost this route completely. A new road was built from Carron to the A88 and numbered B902, thus bypassing Alloa Road. King Street, meanwhile, became part of a rerouted B905. On the other hand the road south from Carron into Falkirk, which was the B905, became an extension of the B902, giving the road its current route.