Stop oversized and hazardous goods vehicles using the Dartford Tunnel

We propose a simple solution: Stop the Convoys and get Dartford moving. Traffic at the Dartford Tunnel is brought to a standstill on average 100 times a day by a small number of oversized & hazardous goods vehicles which need to be escorted through the tunnel, in a convoy.
Each convoy can take up to 2.5 mins to travel through the tunnel, and a tunnel is closed around every 15 mins.
Why should 99% of drivers suffer due to less than 1% of vehicles?
Our suggestion is simple: Stop these oversized/hazardous vehicles using the tunnel & send them the other way around the M25.