The Highways Agency set out its overarching Aiming for Zero Strategy in April 2010. The strategy has an overall aim of significantly reducing health and safety risks to road workers, by eliminating fatalities and serious injuries. More recently the Highway Agency has outlined the third target in this programme: to reduce risks to road workers associated with road works on, or in close proximity, to Impact Protection Vehicles. Meeting this target, whilst not increasing the risk to road users, is the focus of the guidance. This report explains the concepts of dual and single vehicle working, details current practice and evaluates international practices. The aspects of risk involved when using each method are described. Collision modelling was used to explore the likely separation distance required between vehicles and the report also describes the operational factors that need to be considered when conducting a site-specific risk assessment and selecting dual or single vehicle working.

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