Great idea Eddie!..
As your confused driver is heading towards a bridge he can now look away from his steering wheel, fumble around with his keyring and then… still hit the bridge.
If the height indicator in the cab, the height painted on the front of the trailer, the posters all around every depot and common sense don’t stop the green buffoons from walloping anything under 16’ 6" I doubt this latest waste of money will make the slightest difference. 
next stobbie bridge strike thread to appear on tn before july i reckon