Thank you.

How do you know they're Mr and Mrs, though? It could be that the reason he looks so twitchy is that they're on a date; she's sat down in a huff ("Well, there's nothing I can do, it's your car") and he's staring out at the traffic which is passing him by without a second glance, and thinking "Well, there go my chances of getting laid tonight."

So anyway, I meant to say earlier, I loved your analysis of highway code pictures. :)