Motorway signs

I was driving back home today on the motorway, and I passed one of those new very large information signs, these signs I believe that cost £100k each. Anyway, it has a message Don't Drink and Drive... very good advise I am sure, what would of been better is a useful message such as.... 1/2 mile down the motorway you will come across a 5 mile tailback due to an accident.
What a waste of money