Designed to map unplanned diversions when a section of motorway is closed in an emergency, these ‘secret’ signs are in fact 'emergency diversion routes' - symbols that are ready and waiting to spring into action and help drivers find their way through unfamiliar roads and back to the motorway. Read on to find out how they could be used to help beat the jams at any time and cut through the congestion to rejoin the motorway system ahead of the hold-ups. Here’s how they work... Read on to find out how a huge network of 'secret' signs could slash your motorway journey times: Copyright Malc McDonald