I used to see the same thing on the Manchester 100 every year. At least on that event you ended up well spread out, but the first time I did the Manchester-Blackpool was also my last - it was 60-odd miles of madness. Riders crashing into each other all over the place, hardcore RLJing (20 or 30 cyclists at a time darting out into small gaps between cars going in both directions), riding on the wrong side of the road, riders suddenly stopping or starting without signalling or even a look over the shoulder.
No thanks!