Nothing can prevent the sort of accident that occurred a couple of days ago on the M40. An elderly couple with foreign number plates were towing a caravan (going at 70mph!) the wrong way up the fast lane!! They caused a massive collision and they and another driver lost their lives.

Police Interceptors received dozens of calls from the public, but couldn't reach the vehicle until the crash had happened.

I am never ever going to drive on a motorway again. Fortunately, there aren't any in Norfolk, just 'A' roads.