Work Zone Mobility and Safety Program
Photo collage: temporary lane closure, road marking installation, cone with mounted warning light, and drum separated work zones.
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Best Practice


K1−2: Analysis of Work Zone Crash Data


Agencies compile and analyze work zone crash data through ongoing efforts and special studies to help identify areas of concern in work zones. This analysis can identify issues and take corrective actions on individual projects. Such efforts can also identify larger trends and be used to update policies/standards.

The New York State Department of Transportation (NYSDOT) compiles data related to work zone fatalities and injury crashes based on type, area within the work zone, driver characteristics, and type of collision. This information is used to identify trends in driver behavior and potential work zone emphasis areas to improve work zone safety. The information is collected at the NYSDOT Regional level and analyzed by the main office. The information is categorized in many ways including the following:

Accident Category (fatal, hospital, minor, unknown)
Accident Type (e.g., rear end, worker hit by vehicle, etc.)
Work Zone Situation (e.g., alternating 1−way traffic, lane shift, etc.)
Project Related Traffic Accidents at Flagger−Controlled Locations (e.g., head−on, sideswipe, etc.)
Project Related Traffic Accidents based on
o Project Type (e.g., bridge, pavement, maintenance, etc.)
o Facility Type (e.g., principal arterial interstate, minor collector, etc.)
o Driver Characteristics (e.g., age, sex, and locality)
o Time of Day
Accidents Involving
o DOT Employees (e.g., trip or fall, vehicle struck worker, fall from elevated structure, work zone intrusion)
o Consultant Employees
o Contractor Employees

Many other States also collect work zone safety−related information to improve mobility and safety for current projects and future efforts.
The Kansas Department of Transportation (KDOT) collects and analyzes information on crashes in construction zones and then informs law enforcement and construction managers about the crash frequency. As a part of this effort, KDOT staff members provide recommendations for work zone safety improvements to officials for consideration during projects and after projects for future efforts.
The Montana Department of Transportation (MDT) collects and analyzes data on construction crashes and evaluates whether changes need to be made at an individual work zone, or to its policies.


This practice was adopted to identify trends and better develop countermeasures to reduce the deaths and injuries associated with crashes in or near work zones.


Reduced fatalities and injuries are a result of the countermeasures, as well as increased knowledge and situational awareness regarding crashes in work zones.


All locations and projects.

Work Zone Crash Data Analysis (K1−1)
Analysis of Work Zone Crash Trends (K1−3)


Kansas, Montana, New York


Kristina Pyle, Kansas DOT
Phone: (785) 296−0355

Jim Wingerter
Montana DOT
Phone: (406) 454−5897

Chuck Riedel
New York State DOT
Phone: (518) 457−2185

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