The Lemon Fool

Following an Audi Q5 yesterday, a 22 plate, I noticed on the rear bumper the normal red reflectors and lights but also on the nearside corner, a green reflector. Is this normal these days?

That's the mood sensitive reflector option.

It was in the rather unusual state of having detected your envy by driving a lesser vehicle, normally they're red because the **** driving it has just cut you up.

The more prosaic answer is that they are designed to improve night-time visibility.

Watis