Any of you holidaying in Cornwall & using the A38 via Plymouth through the Saltash tunnel - Beware! - they're threatening to turn on the SPECS average speed cameras - the limit is 30 mph, the tunnel has 50,000 cars per day through it, if they turn these on they reckon they'll catch 12,500 motorists per day and raise more money in a week than all the combined cameras in Devon & Cornwall do in a month. It's not an accident blackspot, so they're not safety cameras, just legalised mugging of us lot. As there's a hill to both sides of the tunnel you need to consciously apply your brakes to stay within the limit, especially with a van on the back, as gravity will take you over 30mph quite easily. You've been warned.