"Henry" wrote

On the other side of the coin, a bit further south, the lights on the
southbound A23 at Chipstead Valley Road in Coulsdon only stay red for
about
1 second late in the evening (and have for years). Hardly gives any time
for anything to turn out safely!

If they change to amber as you pass Waitrose, you can be pretty sure they
will be back to green by the time you get there (though better not to rely
on it!).

Rechecked that one at 2300 last night. It did change to amber when by
Waitrose and I never had to slow down doing 30.