Case Studies

Short, illustrative scenarios that show how a common work-zone compliance issue arises, how it is caught, and how it could have been prevented upstream.

Last reviewed: June 24, 2026

When the Closure Did Not Match the Approved PlanA crew set up a lane closure on a busy arterial to complete a repair. The work got underway, but the lane that was closed and the limits of the closure were not the same as what the approved traffic control plan showed.
When a Sidewalk Was Closed With No Accessible RouteWork at a building frontage required closing the sidewalk. Barricades went up at the work, but no alternate route was set up, and people on foot were left to find their own way around.
When Work Started Before the Permit Was ApprovedTo keep a schedule, a crew mobilized and began work in the right-of-way while the permit application was still under review and not yet approved.
When the Documentation Was Not On SiteAn inspector arrived at an otherwise reasonable-looking work zone, but the crew could not produce the approved plan or the permit on site to confirm the setup against.
When Devices Were Left in Place After the WorkA short project wrapped up, but the temporary signs and devices were left in place afterward, so the road still looked like an active work zone when the work was done.
When a Permit Condition Was MissedA crew built a setup that matched the approved traffic control plan drawing. The permit, however, carried a condition — a required notice and a limit on work hours — that had not been carried into the plan or the schedule.
When a Closure Was Assumed, Not ConfirmedPlanning for a project assumed a full lane closure would be allowed on a busy arterial. When the work reached the field, the agency's conditions actually limited the work to off-peak hours with a narrower closure than assumed.
When Business Access Was BlockedA curb-lane project occupied the frontage of several businesses, blocking a driveway and the parking those businesses relied on, without a plan to maintain access during the work.
When Night Work Was Not Visible EnoughA nighttime setup used devices that had lost their reflectivity, and the work lighting created glare toward approaching drivers. Approaching the work after dark, drivers had little to read.
When Upstream Planning Prevented ProblemsBefore mobilizing, a team confirmed the road owner and permit, made sure the approved plan reflected the permit conditions, planned pedestrian and business access, and scheduled the required notices. The setup then matched the approved plan on the first try.