|To:||St Ninians (NS794913)|
|Length:||7.8 miles (12.6 km)|
|Meets:||A803, A883, M9, M80, A91, A9|
|Route outline (key)|
Renumbering came after the building of the M80, and the newly assigned number of A872 starts at the town of Dennyloanhead where it forks from the A803, aside Junction 8 of the M80/M876, although there is no access to either motorway from here. It runs under the M876 without interchange before a sharp left to follow a semicircular “bypass” through Denny – never quite clearing the outer skirts of the town. At the north end of the semicircle, the road reverts to its north-south alignment, turning left again at a former TOTSO, now a mini roundabout, where straight on is the A883 to Falkirk.
After crossing Denny Bridge, the road pulls alongside the M80 and shadows it for around five miles up to Pirnhall Interchange where the M9 and M80 meet, and also home to Stirling services. This is possibly the largest and most complicated motorway junction in Scotland with, all three options available at the motorway triangle (M80 south, M9 north and south), plus Stirling Services and the start of the A91. The A872 emerges from the other side intact and rolls into the Stirling suburbs almost immediately. Bannockburn is but a stone's throw away, and here the tourist route is signposted for the Visitor Centre. The sights on the road make the location very clear – stop off here for a drink at the 1314 Inn or a night's stay at the Robert the Bruce Hotel, both of which line the road. The road snakes up the Whins of Milton to end at a roundabout with the A9 in St Ninians. That road continues ahead into Stirling city centre.
The A872 number was only allocated to this route in 1974 when the M80 opened, replacing the A80 as the main route between Glasgow and Stirling. It is not clear, however, whether the Semi bypass of Denny opened before or after this, meaning that it is possible that the A872 briefly followed the now unclassified Glasgow Road into Denny town centre, and then the A883 route round to Denny Bridge.