I take back what I said last week about amazing vehicle management systems on milk tankers. Last night a GPS took a forty-two tonne tanker onto the three-tonne-rated Cambridge High Level Bridge, in what could have been a catastrophe. The bridge, with which I am very familiar, was designed for people, horses-and-carts, and the occasional small mob of sheep or a few head of cattle. Out of necessisty (witness the traffic mayhem this morning) it now takes cars. NO trailers, and absolutely NO trucks. It's not as if it's difficult to see the warning signs – the approach is designed to slow you right down before you get onto the bridge. But then, if the GPS tells you to go that way, what are a few large, conspicuous warnings on a narrow 117 year-old bridge other than a mere distraction.