The A37 road traffic is naturally a mix of long distance traffic, and more local journeys. Those local ones tend to come from
- Villages en route like Farrington and Clutton
- The Norton Radstock area (joining at Hallatrow and Farrington)
- Some Eastern parts of the Chew Valley
- Wells et al (from the A39)
- Shepton
However, the problem would be where to locate it. You'd have to use green belt land so let's say you put it near the Garden Centre outside Whitchurch. Aside from the planning issues, you'd be onto the A37 and suffering the same traffic issues through Whitchurch Village and past Gilda Square. There is some scope for additional bus lanes from there to just before Happy Landings but then it would have to stop to allow the traffic to access the left turn on the Airport Road. There is a bit of bus lane up into and from the Broadwalk and then a bit more to the Three Lamps but it's a bit hit and miss so don't know how it will work. That said, better bus priority on the Wells Road would be better especially in terms of enforcement on those bits that do exist.