>The other important
>criteria is the off-side cut-off on dip, to avoid blinding oncoming traffic.

Singular. That's CRITERION.

>And what the hell is jacklighting?

It's a light mounted under the car, so you can see where to fit the
jack when you have a flat in the wee hours.

>Ok, I've guessed, but I never cease to be
>amazed at the US terms invented to describe just about everything about the
>world - including tailgating at night. Is that possible anymore anyway, with
>these modern and absurdly over-bright rear lights now being fitted to new
>cars, especilaly those bl*** ridiculous circus lights fitted high-up above
>tail gates - mad, crazy, how is one supposed to pick the subtelties of the
>road ahead by looking through the car in front, or even around it when
>you're being blinded at night by lights that are supposed to be for there
>for safety. Huh! Modern auto engineers seem to be a bunch of immature
>crack-heads out to impress without any real training, study and
>comprehension of ergonomics - and thats what a sensible approach to rear
>light design is - simple ergonomics. I think they should be banned, but what
>has this got to do with headlights - think blue!

Blame the "safety" lobbing morons and the criminals running the gummint.