How fast do you drive when you’re on the motorway? We all know the UK motorway speed limit is 70mph, but the truth is that many of us allow our speed to creep above that level on a fairly regular basis. Indeed, a recent poll by Autocar magazine indicated that a massive 94.6% of motorists drive at more than 70mph on the motorway. It’s the case that the police tend to turn a blind eye and only prosecute drivers seen to be travelling at least 10% above the speed limit. It could be time to start slowing down a bit, though, due to plans to install hidden speed cameras on motorways for the first time. The Highways Agency is planning to put speed cameras, which could well be a discreet grey rather than an eye-catching yellow, on so-called ‘smart’ stretches of motorway, including parts of the M1, the M6 and the M25. Smart motorways are sections of road where the flow of traffic is carefully controlled using measures such as gantry lights and specialist lanes.