On Fri, 7 Feb 2020 15:46:23 +0000 (GMT+00:00), Graham. wrote:

In 2002 I recall being blinded by a (then new) Mercedes ...

Mercs had horrible HID lights as well. Mate had one, he was following
me down the A68 (roamn road, so straight but hilly and bumpy) he was
a mile or more behind but everytime he crested a hill or hit a bump
it looked like he was flashing his headlights. Observation of other
cars exhibting similar "flashing" showed they were all Mercs.

traffic lights have had light sensors for decades.

Not aroud here. The set on Langwathby Bridge(*) don't dim at night.
The green is so bright that you can't see where the entrance to the
girder section is until you are past them and it's not straight on...

(*) Oldest temporary bridge in the UK having been put in place in
1968 after the 300 year old sandstone arch bridge was washed away in
floods a few months earlier.

--
Cheers
Dave.