Ziltro wrote:
I don't suppose Mr. U-Turn had a satellite navigation system did he?

That might seem possible based on recent bad press on these things. Not the gadget at fault really - common sense, basic intelligence and the apparently little read booklet - aka Highwway Code should all combine to tell that a U turn or attempt to reach some obscure cross country road are a :nono>
Yes - had I happened along - even off duty and not in uniform - I think Ian's HQ would have received a phone call and details of reg number. Had benefit of training which means I tend to notice reg plates
Guess all you could learn from this is just watching the potential "vehicle language" from the manner driven as JT has mentioned. Again - part of the chalk up to experience - and I think I once said in my Hendon notes that part of the observation technique does include a very quick appraisal glance of how the driver is postioned in the driver seat. His body language - affecting how he affects other road users. If he looks over his shoulder - sure sign he's planning an overtake if clear to do so. If he's slouching a little - he's not concentrating or if he's slightly turning his head - possibly to chat to his passenger - then again you are on alert for very slight error potential on his part. Not particularly dangerous - admittedly - but enough to cause a concern.
Going back to one of the daft things I saw on a motorway.
Case 1 - was whilst based in the South
I'd noted a car stopped on the hard shoulder and the young lady driver walking away from the car. She'd run out of petrol
I stopped - read her the riot act. Whilst I was doing this - chap on the opposite carriage in L3 stops his car and asks me for directions.

I bawled out some directions in rather blue language (not printable

) to the nearest exit and radioed to another colleage to greet him there if he could make it . (We never caught him.... grrr!! But I had to get him back moving and I was not going to cross the M1 to get his licence either.)
I then whisked the young lady to a petrol station - filled her can - returned to her car and we got her started. By the way I did issue a penalty as running out of petrol on a motorway is careless.
Case 2 - Lorry reversing.
Lorry driver missed the motorway exit so he decided to reverse back

He tried to reverse a significant length to manoeuvre into the slip road
I did not bother with a fixed penalty - I decided this was far too serious an offence. He did whine at me and my partner for a long time though..
Case 3
Driver tries to reverse entire length of slip road.
Succesfully convicted of dangerous driving ...
Not drunk or on drugs but one which I never found out why he wanted to do this. He did have a valid licence as well - no endoresments.