Night lane closure with failed street lighting

Decision: stop the works and make the lane safe until the lighting problem is solved.

The reasoning is not 'the drawing was wrong' but 'the drawing is not controlling the risk on this site tonight'. A code-of-practice layout is a template that assumes certain conditions - an approach the driver can read, a lit environment where the code assumes lighting, and traffic behaving as expected. Three things undermine those assumptions here:

1. Conspicuity. The taper is the point where a driver must first perceive the closure. It is unlit apart from an excavator's work lights, which give glare and shadows rather than a lit line of cones.
2. Evidence from the road itself. Two cone strikes and a hard-braking van within 90 minutes are not bad luck; they are the traffic telling you the closure is being detected too late. Near-miss evidence outranks precedent.
3. Precedent is not a defence. A layout validated at 30 mph cannot be transplanted to 50 mph: both the warning distance and the taper geometry scale with approach speed, and stopping distance roughly quadruples between the two.

Options, in order of preference: bring in towed or vehicle-mounted lighting and additional flashing lamps and re-assess; if the lane cannot be made legible, remove the closure and reinstate the lane; if neither is possible and the repair cannot wait, escalate to a full closure designed for the site. Record the decision and inform the supervisor the same night.

Start from the current edition of the code of practice, not from memory or from the last job. Look up the table for the site's speed limit, which gives the distance from the works to the first advance warning sign and the taper length for the width being taken. Apply the figure for 50 mph. Then ask what the table cannot see:

• Approach geometry - a bend, crest, junction, bus stop or concealed entrance inside the warning distance means drivers first see the signs with no time to act. That is a design change, not a signing tweak.
• Composition of traffic - heavy HGV flow, as here, lengthens the distance needed and raises the consequence of a strike.
• Width available - if the closure leaves an uncomfortably narrow running lane, drivers will not use it predictably.
• Time of day - night working with failed lighting is a different risk picture from a daylight job.
• Vulnerable users - cyclists and pedestrians need a route that does not put them between the cones and the works.

If any single factor cannot be accommodated within the standard layout, the answer is to change the traffic management (temporary signals, lane 2 closure, full closure, convoy working) rather than to accept a layout that is 'nearly right'. Document the reasoning so the next shift inherits the decision.

Restart is a re-assessment, not a switch-on.

Before any cutting resumes:

• Lighting matches the layout actually in place. Lamps should define the taper line and the works area - not stand in a row unrelated to the cones - and must be checked against the current code for lighting of the layout at night.
• No glare to approaching drivers. Work lights and the machine's own lamps angled so they do not blind drivers on the approach or throw the cone line into silhouette.
• The layout itself is intact. With two cones already displaced, walk the closure: taper, signs, longitudinal cones, works vehicle position, sign faces clean and legible.
• The signage still describes the site. If you closed more or less of the road while waiting, the signs must be changed to match.
• The crew is re-briefed on the changed conditions, including anyone who has arrived for the second shift.
• The decision to restart is recorded, with who authorised it and on what basis.

Only after that does the excavator start. If any of these cannot be met, the closure stays but the works do not.