About half of all fatal work zone crashes in 2023 happened at night, and the Federal Highway Administration has put out a fact sheet telling state DOTs what to do about it. Speeding was a factor in more than 30% of fatal work zone crashes that year. More paving, maintenance and utility work is moving to overnight shifts to keep daytime traffic moving, which puts more crews out when drivers are fastest and least alert.
Occupational Health & Safety reported the guidance Oct. 19. The sheet, Advancing Nighttime Work Zone Safety (FHWA-26-CAI-006), comes out of FHWA’s Every Day Counts program. It doesn’t carry the force of law. It’s a menu, not a mandate.
What the night work zone fact sheet recommends
FHWA groups its countermeasures into a handful of buckets. Enforcement, whether officers on site, passive measures or speed cameras, to slow drivers in and near the zone. Anti-glare lighting so workers and drivers can pick out hazards faster. Positive protection, meaning barrier that contains and redirects a vehicle instead of a line of drums. PPE that makes workers visible from farther away. And traffic control upgrades: rumble strips, pavement markings, sequential lights and high-visibility sheeting, plus better coordination of lane shifts, closures and shift schedules.
None of that is new to a traffic control sub. The point of the sheet is to show what agencies are already writing into specs.
State DOT nighttime work zone practices
Six states get named. Illinois DOT wrote a detailed specification for construction lighting and pushed district staff to know the nighttime requirements. Michigan DOT set a standard for inspectors to measure light levels during night operations, so “adequate lighting” becomes a number someone checks. Pennsylvania runs a statewide work zone speed camera program with the Pennsylvania Turnpike and State Police.
The attenuator work is the most interesting. Tennessee DOT requires variable speed limit signs and lane closures on night interstate resurfacing, and it has tested AI-based systems mounted on truck-mounted attenuators that sound a horn and flash lights when an approaching vehicle looks likely to hit. Virginia DOT is developing an automated TMA, plus a siren-and-light alarm for attenuators that still have a driver in the cab. Caltrans is looking at tethered drones carrying high-output lights.
What night work zone safety means for highway contractors
The TMA driver is the most exposed person on many night closures. That was the sequence in the I-10 crash near Blythe, California, last month, where a tractor-trailer hit the attenuator truck first and three workers died. An unmanned TMA takes that seat out of the equation, which is why Virginia’s prototype deserves more attention than the lighting tips.
For bidders, the practical takeaway is that these items tend to show up in contract specs before they show up in regulations. Lighting measured by an inspector, variable speed signs and camera enforcement all cost money and crew time. Contractors who price night work in Illinois, Michigan or Tennessee could see those lines in upcoming special provisions, and other DOTs reading the same fact sheet may follow.