Summer Safety Series
Welcome to The Science Behind Workplace Injuries: 30 Days of Summer Safety, where we explore the environmental hazards, human physiology, behavioral science, and organizational decisions shaping workplace safety. This article is part of our July series examining the science behind workplace injuries and the factors influencing workplace safety during the summer months.
Orange signs. Traffic cones. Lane closures. Flaggers. Flashing lights. Road construction has become one of the most familiar sights of summer. The construction zone familiarity creates an interesting paradox. The more often people encounter work zones, the easier it becomes to believe they understand them. Drivers settle into predictable routines while construction crews perform familiar tasks. Equipment operators work within environments they have seen hundreds of times before. Experience increases efficiency. It can also reduce awareness.
Road construction remains one of the most hazardous occupational environments in the United States. According to the National Safety Council’s analysis of National Highway Traffic Safety Administration data, 850 people were killed and more than 42,000 were injured in work zone crashes during 2024. Looking specifically at workers, CDC/NIOSH reported 1,462 fatal occupational injuries at road construction sites between 2011 and 2022, with 44% involving workers struck by vehicles. The numbers are sobering, although they reveal something important. The greatest threat is the interaction between human attention, routine, and rapidly changing environments.
Experience generally reduces workplace injury rates. New employees experience more injuries while learning unfamiliar equipment, procedures, and hazards. Road construction presents a different challenge as most serious incidents frequently involve low-frequency, high-consequence events that experience alone cannot prevent. A worker who has safely completed the same task for fifteen years remains vulnerable when attention shifts for only a moment or conditions change unexpectedly. Familiarity influences perception but does not eliminate risk.
Neuroscience helps explain why. Habituation is one of the brain’s simplest forms of learning. As people repeatedly encounter the same sights, sounds, and experiences, the brain gradually reduces its response so attention can be directed toward new information. Under most circumstances, habituation is remarkably efficient. It allows people to conserve cognitive resources instead of treating every familiar stimulus as equally important. Road construction challenges that adaptation because many familiar stimuli remain dangerous. Passing traffic, reversing alarms, heavy equipment, and changing vehicle movements continue carrying significant risk even after the brain begins treating them as routine.
Driving research demonstrates how powerful this process becomes. Charlton and Starkey found repeated travel along familiar roads reduced mental workload while increasing inattentional blindness. Participants frequently failed to notice obvious changes in road signs and surrounding landmarks because the brain had learned what it expected to see. We explored this same phenomenon in our article on situational awareness. People cannot respond to hazards they never perceive. Familiarity changes what the brain notices before a decision is ever made.
Behavioral science helps explain why experienced crews sometimes become more vulnerable to low-frequency, high-consequence events. Diane Vaughan introduced the concept of normalization of deviance while studying the Space Shuttle Challenger disaster. The principle describes how repeated success gradually changes what people consider acceptable. A shortcut that produces no immediate consequence begins to feel safe. A truck that has backed into the same area hundreds of times without incident appears predictable. A cone line that has always separated workers from traffic begins to feel like a barrier rather than a visual guide. The environment has not become safer. The brain has simply become more comfortable with the risk.
The danger extends beyond public traffic. One of the most important findings from NIOSH’s Fatality Assessment and Control Evaluation (FACE) Program is that many roadway work-zone fatalities involve construction vehicles operating inside the work zone rather than motorists entering from outside. In one review, fifty-five percent of roadway work-zone fatalities involved construction vehicles or equipment moving within the project itself. Dump trucks, loaders, pavers, rollers, and other heavy equipment constantly change position throughout the day, creating a dynamic environment where awareness must extend in every direction. Situational awareness applies as much inside the work zone as it does beyond the traffic barrels.
Road construction also places extraordinary demands on the human body. Crews routinely work in extreme heat, perform physically demanding tasks, experience prolonged noise exposure, and often work overnight while managing circadian disruption. NIOSH reports the Highway, Street, and Bridge Construction subsector has the highest prevalence of occupational hearing loss within construction, affecting approximately twenty-eight percent of noise-exposed workers. Heat reduces cognitive performance. Fatigue slows reaction time. Hearing loss limits the ability to detect approaching equipment and warning signals. Each challenge independently influences human performance. Together, they create total physiological load.
Workers’ compensation data reinforce the severity of these events. According to NCCI data summarized by the National Safety Council, lost-time claims involving motor vehicle crashes average approximately $91,433, making them among the most expensive claim types in the workers’ compensation system. These incidents frequently involve multiple body regions, traumatic brain injuries, spinal injuries, and catastrophic outcomes requiring prolonged medical care and extended recovery. The cost reflects the tremendous human impact carried by workers, families, employers, and communities.
The encouraging news is that many of these risks can be reduced through thoughtful system design. Positive protection barriers physically separate workers from moving traffic. Internal Traffic Control Plans organize the movement of construction vehicles within the work zone. Automated Flagger Assistance Devices and intrusion alarm systems reduce worker exposure to approaching vehicles. Virtual reality hazard-recognition training helps experienced employees recognize changing conditions before they become incidents. The strongest interventions share one characteristic. They reduce dependence on perfect human attention by improving the work environment itself.
Leadership remains the final layer of protection. Daily pre-task discussions, rotating assignments, fresh-eyes hazard reviews, heat and fatigue management, and encouraging experienced employees to question familiar routines all help interrupt automatic thinking before it becomes automatic risk. The objective is never reducing efficiency. The objective is preserving awareness in environments where familiarity naturally encourages the brain to relax its vigilance.
Road construction is a reminder that experience alone has never been the strongest safety strategy. Experience builds knowledge, confidence, and technical skill. Safe organizations recognize those strengths while designing systems that account for predictable human behavior. The safest work zones are the ones where engineering, leadership, and human performance work together to ensure familiarity never replaces awareness.
Tomorrow in The Science Behind Workplace Injuries – Summer Driving: Why Motor Vehicle Claims Increase This Time of Year. Summer places more vehicles on the road, introduces unfamiliar drivers, increases recreational travel, and creates new distractions behind the wheel. Tomorrow, we explore why motor vehicle crashes remain one of the most significant sources of workers’ compensation claims and what neuroscience teaches us about attention, speed, and safe driving.
