Boise Work Zone and Construction Zone Accident Lawyers

Work zone crashes are rarely just about the driver who caused them — contractors, traffic control subcontractors, and government agencies all share potential liability

I-84 widening. The Eagle Road corridor project. Chinden Boulevard expansion. Downtown Boise utility work. Summer chip seals on Ada County roads. The Treasure Valley has been in a near-continuous state of road construction for years, and Idaho’s work zones produce a predictable set of serious crashes each season. What makes work zone crashes legally different from ordinary car accidents is that liability rarely belongs to the driver alone. The contractor who designed the traffic control plan, the subcontractor who set up the signing and tapers, and — in some cases — ITD or ACHD who approved and oversees the project can all share responsibility when a work zone is unsafe.

Idaho law doubles traffic fines for violations committed in active work zones. That legislative decision reflects a recognition that work zones are inherently more dangerous than normal road conditions and that drivers operating in them are held to a higher standard of care. When an at-fault driver receives a citation for a work zone traffic violation, that citation is powerful evidence of negligence per se in the civil case — and the double-fine provision underscores for juries that the driver operated recklessly in a zone designed to protect workers and motorists alike.

Our firm has been practicing personal injury law in Idaho for more than 50 years. Our attorney team has practiced car accident law for well over a combined 100+ years. For a full overview of all car accident claims we handle in Idaho, see our main car accident hub. For background on the Idaho Tort Claims Act requirements that govern government entity claims in work zone cases, see our page on dangerous roads and intersections in Idaho.

Hepworth Holzer also helps residents of Idaho with Personal Injury Matters in: Ada County, Caldwell, Canyon County, Eagle, Garden City, Gem County, Kuna, Meridian, Nampa and Star.

Work Zone Crash Patterns We Handle

Work zone crashes follow predictable patterns driven by the hazards that construction introduces into the driving environment:

• Rear-end at sudden lane closures. The most common work zone crash type. A driver approaches a lane closure without adequate advance warning — because the taper was too short, the advance signing was missing or obscured, or the flagger was in an inappropriate position — and rear-ends the vehicle ahead that has already slowed or stopped. The crash that results is partly the driver’s fault and partly the contractor’s failure to comply with MUTCD taper and signing requirements.
• Sideswipes in merge zones. When lane closures are announced too close to the actual restriction, drivers race to merge at the last moment and sideswipe other vehicles in the merge queue. Work zone design that forces late merging — rather than designing for zipper merging earlier — produces a predictable pattern of sideswipe crashes.
• Strikes of stopped or slow-moving work vehicles. Work vehicles parked or moving slowly within the travel lane, without adequate buffer space or shadow vehicle protection, are struck by inattentive or speeding drivers. The presence of the work vehicle is the contractor’s exposure; the failure to see it is the driver’s.
• Worker struck by a motorist. When a worker is in or near the travel lane without adequate physical separation, lateral buffer, or appropriate PPE and warning equipment, the crash produces two separate legal tracks: a workers’ compensation claim against the worker’s employer and a third-party negligence claim against the at-fault driver and potentially the contractor whose traffic control plan failed to protect the worker.
• Lane-shift crashes. When traffic is redirected through a lane shift — moving from the normal alignment into a temporary alignment — inadequate signing, unclear pavement markings, and insufficient delineation can cause drivers to miss the shift and strike work zone barriers or equipment.
• Night work crashes. Construction work conducted at night introduces specific hazards — reduced visibility, contrast issues with temporary striping, inadequate lighting of the work zone, and retroreflectivity failures of signage and delineators — that the MUTCD addresses with specific nighttime work zone standards. When a contractor does not meet those standards, nighttime crashes that would not have occurred in the daytime become partly the contractor’s responsibility.

Who Can Be Liable in a Work Zone Crash

The at-fault driver. Every work zone crash begins with the driver’s conduct. A driver who rear-ends, sideswipes, or strikes a worker in a work zone is liable for negligence. A work zone citation doubles the fine and strengthens the civil negligence case. When the conduct rises to recklessness — excessive speed through a clearly marked active work zone — punitive damages under Idaho Code Section 6-1604 may be available.

The prime contractor. The construction contractor on an Idaho Department of Transportation or local government project is contractually responsible for implementing and maintaining a traffic control plan (TCP) that complies with the Manual on Uniform Traffic Control Devices (MUTCD) and Idaho’s supplement to the MUTCD. When the TCP is deficient — tapers that are too short for the approach speed, advance warning signs that are missing or improperly placed, buffer spaces that are inadequate, night-work retroreflectivity that falls below standard — the contractor’s commercial general liability (CGL) policy is the recovery target alongside the driver’s auto liability.

The traffic control subcontractor. On larger projects, traffic control — the signs, cones, drums, barriers, flaggers, and their placement and maintenance — is frequently subcontracted to a specialized traffic control company. When the subcontractor’s implementation deviated from the approved TCP or from MUTCD standards, the subcontractor shares direct liability for the resulting crash.

The Idaho Transportation Department or local highway district. When ITD, ACHD, or a county highway district designed the work zone plan, approved the TCP, or exercises ongoing oversight of traffic control on the project, they can share liability for deficiencies in the plan or for their failure to correct known unsafe conditions. Claims against these government entities are governed by the Idaho Tort Claims Act under Idaho Code Section 6-901 et seq., which requires a written notice of tort claim served on the correct entity within 180 days of the crash. This is a hard deadline. Missing it permanently bars the government claim regardless of how strong the underlying evidence is.