I was in a genuine bicycle traffic jam on the shared-use bollocks up to Mr Sainsbury's Emporium Of Toothy Comestibles earlier. The cause of the hold-up was a FOREIGN PSO on a sensible[1] Ridgeback failing to keep up with her friend on some kind of electric-assist clown bike, particularly on the uphill bit. I suspect this was because - either through ignorance or mechanical necessity - the gears were in small:small, but the handlebar danglebag certainly wasn't improving matters.
A pedestrian-free gap eventually opened up, and I passed her as she tacked across to the pedestrian side of the path. This was a tactical error, as she startled and wobbled into me. Fortunately I was able to avoid actual contact by speeding up[2] and moving right. The cyclist behind me had dismounted as soon as the Z-axis came into play, so further conflict was avoided.
All in all, I consider this to be a good sign. People using bikes! In Birmingham!
[1] Mudguards, rear rack, etc.
[2] I may have reached 10mph.