Posted By Tony Bish Have read quickly through the Red Book - Safety at Stree and Road Works, A Code of Practice - and there is no quick answer to this question. Basic requirements given for mobile work identify the need for advance signage, roof mounted beacons, directional arrow on vehicle to show which side to pass etc. It also states that single vehicle working must not be carried out on dual carriageways to which the national speed limit applies. There is no vehicle to works distance given for mobile working. Past experience here has shown that if there is too much gap the traffic will cut in and possibly hit the workers, too little and in the event of shunt they get hit by their own protective vehicle. Each situation and even sections of the same road will have different hazards and require risk assessment. We carry out litter picking of a dual carriageway A road which has the national speed limit - following risk assessment this is now only done under the minimum protection of mobile lane closure using at least two advance vehicles ( one is an HGV bump stop equipped lorry ) to protect the works vehicle and staff working at the roadside. In some sections poor visibility and traffic speed require lane closure working only.

Posted By Peter Moran When installing traffic-management components such as signs, cones etc the Chapter 8 recommendation is for a minimum distance of 50m behind the men concerned..under motorway conditions I have seen the distance increased to 100m at times.