I think it's a great idea.
I'v seen it plenty of times when i'v noticed any emergency vehicle approaching from behind (a good few vehicles behind). Move across to lane two in plenty of time and cars keep on passing me because they havn't seen whats coming from behind yet.
Then when it's passed the cars that have already passed me infront are then holding up the emergency vehicle. Twonks......like it says on the link above, people need to look in there mirrors more often.
Now where can i get one of these devices
