Traffic Management and Site Layout on the Highway
Designing the layout
A traffic management layout is a compromise between the space the works need and the space traffic and pedestrians need to pass safely. Start from the speed limit and traffic flow, then decide the control method: lane closure with cones and a taper, give-and-take (single lane, priority signs), portable or temporary signals, stop/go boards at low speeds and short lengths, convoy working, or contraflow. Each has a speed range and a length limit, and the plan must show signs, cones, barriers, safety zones and the works area drawn to scale.
Key layout principles: keep a safety zone between the live lane and the works - an area no one enters and nothing is stored in; taper vehicles out gently before the closure, never at the last metre; keep works vehicles inside the closure; maintain access for emergency services and keep hydrants, gullies and driveways usable where practicable; sign diversion routes and temporary speed limits clearly and remove them when finished.
Traps
Questions love the storage error: materials, spoil or a generator parked in the safety zone or in the taper. Another is the works vehicle parked outside the closure and operatives walking to it along the live lane. Also watch for layouts left unchanged when the work moves along the road, and for pedestrians diverted into a live lane with no protection.
Rule of thumb: if a driver has to steer, brake or read a sign while inside the taper, the taper is wrong - move the warning back, not the cones closer.
Recording
Record the layout as installed, re-check it each shift and after any incident, and amend the plan when the site changes.