BTW. Six sets of SPECS were installed beginning of the week on A2 around Darenth Interchange - (it's the Darford Tunnel/M25 Interchange) both eastbound and westbound. They measure speed in all possible directions - A2 to M25 , M25 to A2 and A2 via underpass. Major roadworks is the official reason for installation, speed limit is 50, no workers in sight, looks like they plan to narrow down A2 to 2 lanes over next 6 months....