A worker is struck by a backing excavator twenty feet from where the foreman is standing. Nobody saw it coming because nobody was assigned to look.
That scenario is not a worst-case hypothetical. It is a pattern. In nearly three decades of investigating workplace incidents and conducting construction safety audits, I've found that struck-by accidents involving heavy equipment follow a remarkably consistent sequence: a piece of equipment moves, a worker is in or near the path of that movement, and there is no one actively managing the intersection between the two. The equipment didn't malfunction. The operator wasn't incompetent. The breakdown was a coordination failure, a gap in the system designed to keep people and machines separated.
According to OSHA's struck-by hazard data, approximately 75 percent of struck-by fatalities in construction involve heavy equipment such as trucks or cranes. Struck-by hazards are one of OSHA's Fatal Four — the four cause categories responsible for the majority of construction fatalities. And according to the U.S. Bureau of Labor Statistics' 2024 Census of Fatal Occupational Injuries, pedestrian incidents involving motorized land vehicles increased 19 percent in 2024 compared to the prior year.
This article covers what OSHA explicitly requires for spotter use and pedestrian protection around heavy equipment, how a complete pedestrian safety system is built, and what employers in Utah should understand about their obligations.
Struck-by hazards are the second leading cause of construction fatalities, surpassed only by falls. OSHA's construction struck-by resources are direct: approximately 75 percent of struck-by fatalities involve heavy equipment such as trucks or cranes. That figure has held consistent across years of data, which means the problem is not primarily a training awareness issue. It is a systems issue — a failure to build and maintain the physical and procedural controls that keep workers out of equipment operating zones.
According to OSHA's motor vehicle safety data for construction, more than 100 workers are killed and over 20,000 are injured annually in the highway and street construction industry alone. Vehicles and equipment operating inside the work zone are involved in over half of those worker fatalities; meaning the threat comes as much from equipment inside the site perimeter as from passing traffic.
For employers operating in Utah, the context is acute. The Wasatch Front corridor — Salt Lake City, Provo, Ogden, and the growing communities between them — has been in sustained construction activity for years. Transportation projects, high-density residential development, commercial expansion, and utility infrastructure work create job sites where heavy equipment and foot workers operate in tight proximity. A struck-by fatality on a Salt Lake City job site follows the same sequence as one anywhere else in the country. The coordination failure is the constant.
Under 29 CFR 1926.601(b)(4), OSHA's minimum requirement is straightforward: no employer shall use any motor vehicle with an obstructed view to the rear unless (i) the vehicle has a reverse signal alarm audible above surrounding noise levels, or (ii) the vehicle is backed up only when an observer signals that it is safe to do so. For earthmoving and compacting equipment specifically, 29 CFR 1926.602(a)(9)(ii) carries a parallel requirement for signaling when the operator's rear view is obstructed and no backup alarm is present.
The standard offers a binary choice: install a functioning backup alarm, or ensure an observer clears the path before backing. It is worth understanding what the minimum actually requires. The observer requirement in the regulation is for signaling, confirming it is safe to proceed. Active guidance of the equipment operator throughout a complex maneuver, monitoring for changing hazards, and maintaining communication protocols are best practice built on top of that minimum. On congested sites where backup alarms are sounding constantly and workers habituate to them, a trained, dedicated spotter provides a quality of protection the regulatory minimum cannot.
When heavy equipment operates near overhead power lines, OSHA's crane and derrick standard 29 CFR 1926.1408 requires specific controls. When a dedicated spotter is selected as the primary control measure for maintaining clearance from power lines, the requirements are detailed and non-negotiable: the spotter must be in continuous contact with the operator, be positioned to effectively gauge the clearance distance, be equipped with a visual aid to identify the minimum clearance boundary, and have completed training explicitly covering the requirements of that standard.
This is a more demanding requirement than the general observer standard. A dedicated spotter near power lines is a designated safety function, not a task that can be casually reassigned or replaced mid-operation without briefing. The spotter's positioning, communication method, and visual reference aids are all required elements — not just the decision to have a spotter present.
If you operate equipment near overhead lines, also review SafetyPro's article on electrical safety hazards in construction, which addresses minimum clearance requirements and what happens when spotters are not assigned or are not paying attention. For the documentation obligations that accompany electrical safety programs, see our article on OSHA electrical safety documentation [link to Blog 1: OSHA Electrical Safety Documentation — insert URL when live].
Under 29 CFR 1910.178 — OSHA's powered industrial truck standard — permanent aisles and passageways must be free from obstructions and appropriately marked where mechanical handling equipment is used. The construction parallel is enforced through the General Duty Clause: employers must provide workplaces free from recognized hazards, and failure to establish clear pedestrian separation from equipment travel paths constitutes a recognized hazard.
In practice, this means establishing designated pedestrian routes that are physically separated from equipment lanes wherever practicable. On sites where physical separation is not possible, administrative controls (controlled crossing points, required eye contact before crossing, flagging protocols) must substitute. The absence of any pedestrian separation system is a citation waiting to happen.
No single OSHA standard is titled "internal traffic control plan," but the obligation to have one is clearly established through a combination of 29 CFR 1926 Subpart O (motor vehicles), the General Duty Clause, and standard industry practice. An internal traffic control plan organizes foot traffic and equipment routes to minimize intersection points. It should identify: designated equipment travel lanes, designated pedestrian corridors, controlled access points where equipment and pedestrian paths must cross, exclusion zones around active equipment operations, and required signage and barrier locations.
On active construction sites, that plan must be updated as site conditions change — which, in construction, can happen daily. A plan that accurately described the site in week two of a project may be dangerously obsolete by week eight. Pre-shift reviews of traffic routing should be standard practice.
OSHA explicitly requires either a backup alarm or an observer signal for vehicles backing with obstructed views, and a dedicated trained spotter when that measure is selected for power line clearance. Beyond those minimums, deploying an active guiding spotter is best practice any time an equipment operator's full field of view is compromised, the work site is congested with workers on foot, visibility is limited by weather or lighting conditions, the equipment is operating near excavations or other ground-level hazards, or multiple pieces of equipment and foot workers are sharing a confined work area. On most active construction sites, those conditions describe much of the working day.
SafetyPro's article on heavy equipment operator safety tips covers the spotter's role in more detail, including buffer zone establishment and how to coordinate spotter responsibilities when multiple pieces of equipment are operating simultaneously.
OSHA requires employers to train all workers assigned to spotting duties so they understand the risks and proper procedures before assuming the role. For dedicated spotters near power lines, 29 CFR 1926.1408 specifies that training must cover the applicable requirements of that standard. For general observer or spotting duties, training must at minimum address hazard recognition, proper signaling methods, and the operator's responsibilities when signals are unclear.
Effective spotter training covers five core areas: hazard recognition on the specific job site including blind spots for each piece of equipment being spotted; the agreed-upon hand signal system in use on that site; radio communication procedures as a backup to visual signals; positioning rules including where to stand relative to the equipment's travel path; and the absolute rule that an operator must stop immediately upon losing sight of the spotter, regardless of what other pressure exists to keep moving.
The signal system deserves specific attention. There is no single universally recognized set of hand signals for heavy equipment spotting. Before any spotting operation begins, the spotter and operator must explicitly agree on the signals they will use and confirm mutual understanding. On job sites with multiple operators, standardizing the signal system across the entire site prevents the confusion that occurs when different crews use different conventions.
A spotter must be positioned to maintain a clear view of the areas the operator cannot see, and simultaneously must not be in a position where the equipment could strike them. If no position satisfies both requirements, the move must stop until the equipment and site can be reorganized to allow safe spotting.
Spotters should avoid walking backwards while giving signals. If the spotter is moving, they need to see where they are going. High-visibility vests (ANSI Class 2 at minimum, Class 3 in roadway construction zones) are required PPE for spotters and all workers in equipment operating areas.
Two-way radios provide a reliable backup to hand signals on noisy sites or when line-of-sight visibility is limited. The cardinal rule: if the operator cannot see the spotter and cannot reach them by radio, the equipment stops. There is no exception for productivity pressure or schedule constraints.
The hierarchy of controls applied to pedestrian and equipment interaction starts with physical separation. Permanent barriers, jersey barriers, fencing, and clearly marked exclusion zones keep pedestrians out of equipment operating areas without relying on anyone to remember the rules. Where physical barriers are not practicable, painted travel lanes and stanchion systems create visual separation that reinforces safe behavior.
Convex mirrors at blind corners and intersections extend visibility around obstacles. Backup cameras and proximity detection systems on equipment reduce reliance on spotters for routine maneuvering while providing an additional safety layer. These technologies do not eliminate the need for spotters in congested or complex environments, but they reduce the frequency of the highest-risk maneuvers.
Shift scheduling can reduce pedestrian and equipment overlap, but it cannot eliminate it entirely on active construction sites. Pre-task planning — specifically reviewing equipment movement paths and pedestrian zones before each shift — ensures that workers know where equipment will be operating and when. Site orientations for all new workers and visitors must include traffic control procedures, not just general safety awareness.
A written site safety plan that includes pedestrian protection should be reviewed with all workers at the start of the project and updated whenever site conditions change significantly. That plan should assign specific responsibility for managing pedestrian and equipment interaction, not leave it to informal coordination.
Workers in areas where heavy equipment operates must wear high-visibility clothing appropriate for the task. ANSI/ISEA 107 Class 2 vests are the minimum for most construction applications. Class 3 garments with full high-visibility coverage are required in roadway construction work zones and in any area where vehicle speeds and traffic density create elevated struck-by risk. Hard hats and appropriate footwear are baseline requirements.
PPE is the last layer of protection. When an operator does not see a worker despite all other controls, high-visibility clothing provides the final opportunity to prevent contact. Relying on PPE as the primary means of protection (rather than the last resort) is a sign of an inadequate pedestrian safety program.
OSHA's requirements for preventing struck-by accidents go beyond deploying spotters or backup alarms. According to SafetyPro's guidance on vehicle backover and struck-by accidents, employer obligations include: conducting hazard assessments of all vehicles and equipment on the job site, posting traffic safety and warning signs at hazard points, using barricades to separate work zones, providing safety training for all workers and equipment operators, providing and requiring appropriate PPE, and ensuring all operators are licensed or certified for the equipment they are operating.
Each of these obligations should be documented. Hazard assessments should be recorded and dated. Training should be documented with attendee names, dates, and topics covered. Equipment operator certifications should be on file. When OSHA investigates a struck-by incident, documentation of these activities demonstrates that the employer had a functioning safety system — not that they are assembling one after the fact.
The financial exposure for failures in this area is substantial. As of January 15, 2025, OSHA's maximum penalty for a serious violation is $16,550. A willful or repeated violation carries a maximum of $165,514. A struck-by fatality almost always triggers a comprehensive inspection of the entire site, and citations across multiple standards are common outcomes.
Utah's construction market has grown significantly over the past decade. Active projects across the I-15 corridor, TRAX and transit expansion, downtown Salt Lake City development, and industrial growth along the Wasatch Front create job sites that present exactly the coordination challenges that lead to struck-by incidents. Private sector employers in Utah fall under UOSH jurisdiction, which enforces standards at least as stringent as federal OSHA.
UOSH compliance officers conduct inspections based on injury rate data, imminent danger reports, fatalities, and worker complaints. Any work-related fatality must be reported to UOSH within eight hours. The same documentation obligations that apply under federal OSHA apply in Utah — and UOSH inspectors look for the same records: hazard assessments, training documentation, traffic control plans, and equipment inspection logs.
Worried your staff don’t have the necessary skills? We’ve got you covered. For employers seeking to develop or strengthen their struck-by hazard training programs, SafetypPro employee training courses provide a recognized, locally accessible option.
A practical site assessment for pedestrian and heavy equipment safety addresses five areas:
If that assessment reveals gaps, or if you have received struck-by citations and are not confident in your current controls, SafetyPro Resources provides construction safety audits and construction safety management services designed to identify specific hazards and implement practical solutions. Contact us at (800) 941-0714 or visit safetyproresources.com to discuss your site's needs.
Under 29 CFR 1926.601(b)(4), OSHA requires either a backup alarm or an observer signal before any vehicle with an obstructed rear view backs up. The standard's minimum for the observer role is signaling that it is safe to proceed. Active guidance throughout a maneuver — what most people mean by "spotting" — is industry best practice built on that minimum, and OSHA's recommended approach for congested sites. Under 29 CFR 1926.1408, a dedicated trained spotter is explicitly required when selected as the control measure for maintaining power line clearance.
OSHA requires employers to train workers assigned as spotters before they assume the role. Training must cover the applicable OSHA standards for the specific spotting task, hazard recognition, the site-specific hand signal system, radio communication backup procedures, positioning rules, and the absolute obligation to stop equipment when signals are lost or unclear. Dedicated spotters near power lines must receive training specifically covering 29 CFR 1926.1408 requirements.
An internal traffic control plan organizes vehicle and equipment travel routes and pedestrian corridors to minimize the points where they intersect. It identifies equipment travel lanes, designated pedestrian routes, controlled crossing points, exclusion zones around active operations, and required signage and barrier locations. The plan must be updated whenever site conditions change significantly.
Workers in areas where heavy equipment operates must wear high-visibility clothing meeting ANSI/ISEA 107 standards — Class 2 at minimum for most construction applications, and Class 3 for roadway construction work zones. Hard hats and appropriate footwear are baseline requirements. High-visibility clothing is the last layer of protection and should not be relied upon as the primary means of preventing struck-by incidents.
Key OSHA standards governing pedestrian safety around heavy equipment include 29 CFR 1926.601(b)(4) (backup alarm or observer signal for vehicles with obstructed rear views), 29 CFR 1926.602(a)(9)(ii) (parallel requirement for earthmoving and compacting equipment), 29 CFR 1926.1408 (dedicated spotter requirements near power lines), and 29 CFR 1910.178 (pedestrian walkway separation for powered industrial trucks). The General Duty Clause extends these obligations to any recognized hazard from the interaction of pedestrians and heavy equipment, even where specific standards do not explicitly address the scenario.
As of January 15, 2025, OSHA's maximum penalty for a serious violation is $16,550 per violation. A willful or repeated violation carries a maximum of $165,514 per violation. A struck-by fatality typically triggers a comprehensive inspection, and citations across multiple standards are common outcomes. These figures are updated annually for inflation under the Federal Civil Penalties Inflation Adjustment Act.
Lance Roux, CSP, is the Founder and Principal Consultant at SafetyPro Resources, LLC. He is a Certified Safety Professional with nearly three decades of experience across petrochemical, construction, healthcare, chemical processing, refinery, power generation, and shipyard industries. Lance has investigated struck-by incidents, conducted heavy equipment safety audits, and developed pedestrian safety programs for contractors and industrial facility operators throughout the Gulf Coast and across the United States. He has served as Louisiana Area Director for the American Society of Safety Professionals, President of the Greater Baton Rouge ASSP Chapter, and Chairman of the Associated General Contractors of Louisiana Safety Committee.
SafetyPro Resources, LLC provides safety consulting services, construction safety management, safety auditing, and employee safety training for employers across the United States. Contact SafetyPro at (800) 941-0714 or visit safetyproresources.com.
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