Tim Streater gurgled happily, sounding much
like they were saying:

If I'm stooging along the motorway at 65, look in the mirror,
and decide to overtake as the klod behind is a long way off, my
expectation is that he will still be a long way behind after
I've moved to the fast lane. I don't expect to find him up my
exhaust because the **** was doing 110.

If you're "looking", but not for long enough to gauge their rate
of approach, then you're not looking properly.

There is that, but if their rate of approach is low you may have
to look for too long.

Umm, you'd be able to tell their rate of approach was slow enough
not to be an issue, wouldn't you...?

Normally yes, but if the clown is going really fast then he may not
be that visible when you look.

If your eyesight is so poor that you are unable to see somebody closing
at a difference of 45mph (20 metres per second), then I wonder how you
cope with pulling out of a side junction onto an NSL road?

I mean he may not even have been in sight.

sigh
It's basic mathematics, Tim.

You're doing 65. He's doing 110. That's a difference of 45mph.
45mph is 72kph.
72,000 metres in an hour is 1.2km in a minute is 20 metres per second.

If he's "not in sight", then he's not going to be right up on your arse
THAT quickly, is he?

And then I'd rather focus on the lorry I'm overtaking, thanks.

Your hazard perception priorities are wrong. The truck is a far more
predictable, and therefore lower, risk.

You wouldn't say that if you lived anywhere near the A14 between
Cambridge and Huntingdon.

Ooh, let me think - it's a whole five days since I was last on that
stretch of A14.