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FHWA Home / Safety / Roadway Safety Data Program (RSDP)

Safety Data Case Studies

The Roadway Safety Data Program is working with state and local agencies to develop case studies around roadway safety data collection, management, and analysis issues. These case studies help illuminate both the challenges encountered by agencies on data issues and the solutions they are implementing to address the challenges.

Year Title State
2017
2017

Delaware Valley Regional Planning Commission's Innovative Traffic Data Sharing Practices
This case study highlights how the Delaware Valley Regional Planning Commission (DVRPC) promotes traffic data sharing with other agencies and makes traffic and geographic information system data available to the public.

Pennsylvania
2017

Virginia Department of Transportation Innovative Procedures in Traffic Volume Estimation
This case study presents how the Virginia Department of Transportation (VDOT) estimates traffic volumes on secondary local roadways using a trip generation method instead of taking short-duration counts in the field.

Virginia
2017

New York State Department of Transportation: Engagement of Local Agencies in Traffic Volume Collection and Random Sampling Procedures
This case study highlights two noteworthy practices at the New York State Department of Transportation regarding traffic data collection agreements with local agencies and random sampling procedures to select short-duration traffic count locations

New York
2017

Southeast Michigan Council of Governments: Innovative Traffic Data Quality Assurance/Quality Control Procedures and Automating AADT Estimation
This case study highlights two noteworthy practices at the Southeast Michigan Council of Governments regarding short-duration traffic count validation procedures and an automated annual average daily traffic estimation process.

Michigan
2017

Asset Management in Oregon Case Study
The Oregon Department of Transportation (ODOT) is responsible for managing and maintaining its roadway assets. Managed assets include barriers, traffic signals, lighting, pavement markings, and signs. ODOT has developed an innovative inventory of its assets and evaluates asset condition in order to efficiently manage maintenance efforts.

Oregon
2016
2016

Washington State and Tribal Data Sharing Partnership
The Washington State Department of Transportation successfully partners with tribes to share data and tools helping to improve safety at the local level.

Washington
2016

Pennsylvania's State-Specific SPFs and CMFs
Pennsylvania Department of Transportation (PennDOT) used Part C of the Highway Safety Manual (HSM) to develop State-specific safety performance functions (SPFs). PennDOT believes that pre-selecting applicable CMFS, and developing State-specific and regionally calibrated SPFs offers the best approach for addressing the State’s unique features and for dealing with the inherent differences among areas within the State.

Pennsylvania
2016

South Carolina Safety Data Improvements Through Electronic Crash System Deployment
The South Carolina Department of Transportation (SCDOT) and the South Carolina Department of Public Safety (SCDPS) implemented the South Carolina Collision and Ticket Tracking System (SCCATTS), a long-term initiative to improve law enforcement data quality. SCCATTS supports decision making with quality data and efficient data sharing among stakeholders

South Carolina
2016

Maryland's Data Linkage and Analysis to Support Decision making
The University of Maryland’s National Study Center for Trauma and Emergency Medical Services (NSC) receives data from several State agencies and provides integrated data analysis using the Crash Outcome Data Evaluation System (CODES) methodology.

Maryland
2016

Alabama's Safety Planning Tols for MPOs Roadway Safety Data and Analysis
The Alabama Department of Transportation (ALDOT) led the effort to develop ALSAFE, a spreadsheet-based safety tool that can be used for short- and long-range transportation safety planning. ALDOT developed ALSAFE to serve as a safety planning tool for Metropolitan Planning Organizations (MPOs).

Alabama
2016

Systemic Safety Analysis in Illinois
The Illinois Department of Transportation (IDOT) published the AASHTO Highway Safety Manual Illinois User Guide with Illinois Calibration Factor and Default Values in 2014. Also in 2014, IDOT published the Systemic Safety Improvements: Analysis, Guidelines and Procedures Guidebook.

Illinois
2016

Roadway Safety Data Governance in Illinois
The Illinois Department of Transportation (IDOT) has implemented an enterprise data governance approach for managing data collection, storage, distribution, and use throughout the organization. The Illinois Traffic Records Coordinating Committee (ITRCC) works to advance IDOT safety analysis activities, which includes identifying severe crash locations and segments, prioritizing locations for treatment, and performing systemic safety analyses.

Illinois
2016

North Carolina's State-Specific CMFs
North Carolina is one of a small number of States that have actively pursued developing their own crash modification factor (CMF) "short list" for countermeasures that are deployed throughout the State. The North Carolina Department of Transportation (NCDOT) wanted to develop a list of CMFs to use in benefit cost analyses across the State.

North Carolina
2016

Arizona Importing Local and Tribal Data For Safety Analysis
The Arizona DOT is importing Local and Tribal data for safety. A joint pilot project with FHWA encouraged ADOT to create a new process allowing business users to import the data from local agencies, export combined State and local/tribal data, and load data into AASHTOWare Safety Analyst™ for analysis.

Arizona
2016

Utah's and Kentucky's Innovative Use of GIS-Based Tools
The objective of this case study is to illustrate Kentucky and Utah DOTs effective use of usRAP and UPlan, respectively. Both programs include data collection, and analysis methods that facilitate highway safety improvements.

Utah, Kentucky
2016

Tennessee's Horizontal Curve Database
In 2012, the Tennessee Department of Transportation (TDOT) accomplished its initial data collection for its entire roadway network, which includes all interstates, state highways, arterials, collectors, and local roads. With these data, TDOT created a horizontal curve database with approximately 40,000 miles of roadways with curves.

Tennessee
2016

Delaware Valley Regional Planning Commission (DVRPC) Integrating Safety into the Planning Process at the MPO Level
The Delaware Valley Regional Planning Commission has been using GIS in planning and programming for project selection. The tri-state area of South New Jersey, Delaware, and Pennsylvania have promoted the shared resources as a way of keeping safety as a priority in the planning process.

Delaware
2016

Colorado's Implementation of Level of Service of Safety
The objective of this case study is to illustrate how Colorado uses GIS to spatially integrate roadway data with crash data, develop SPFs, visualize data, and implement the Level of Service of Safety (LOSS) method to assess a roadway’s safety performance.

Colorado
2016

Iowa's Real-Time Data Integration of Snowplow Information and Roadway Safety
Iowa has been in the forefront of using GIS finding new and innovative ways to improve safety. The case study highlights a GIS-based tracking system tied to the snow removal operation.

Iowa
2015
2015

New Hampshire's Intersection Inventory
New Hampshire is one of the states successfully using Safety Analyst. The case study highlights their efforts to also develop an intersection inventory to enhance the data available for analysis.

New Hampshire
2015

Michigan Department of Transportation Safety Data Processes and Governance Practices
The purpose of this case study is to summarize how the MDOT incorporates a data governance structure into their standard business operations and how it has helped them to improve their safety data systems and processes.

Michigan
2015

New Hampshire Department of Transportation Safety Data Systems and Processes
The purpose of this case study is to highlight noteworthy practices of the New Hampshire Department of Transportation in leveraging technology to enhance safety data management.

New Hampshire
2015

Utah Department of Transportation Safety Data Processes and Governance Practices
The purpose of this case study is to highlight innovative data management strategies at Utah Department of Transportation (UDOT) that support the use of technology to benefit safety programs.

Utah
2015

Developing and Using State Specific Safety Performance Functions (SPFS) In Virginia Roadway Safety and Analysis
The Virginia Department of Transportation (VDOT) emphasizes data-driven decision-making And demonstrates leadership to improve safety and safety data. As a result, VDOT developed and implemented a comprehensive set of State-specific Safety Performance Functions (SPFs) covering 98 percent of its State-maintained roadway locations.

Virginia
2014
2014 Roadway Safety Data and Analysis Case Study – Collection and Use of Roadway Asset Data in Utah
The data collection effort performed by UDOT was a first-of-its-kind, surveying the entire state roadway network and obtaining a wide set of data elements. LiDAR (a term that combines "light" and "radar") was used by the selected vendor to collect a variety of asset data. The LiDAR technology creates a three dimensional model of the assets scanned along the roadway, and is performed in a single pass at highway speeds.
Utah
2014 Tennessee Roadway Information System
This case study outlines a centralized, State-led data collection effort for safety data and analysis. The Tennessee Roadway Information Management System (TRIMS) is a single integrated system that includes State and local roadways, structures, pavement, traffic, photo logs, and crash data.
Tennessee
2014

Michigan Roadsoft – Integration of State and Local Safety Data Case Study
The program provides roadway asset management, field data collection, maintenance management, and safety analysis tools to local agencies. Each local agency maintains its own data in a local copy of Roadsoft and shares that information with the State upon request.

Michigan
2014

Ohio Location Based Response System – Integration of State and Local Safety Data Case Study
The program provides consistent location referencing for all public roadways. ODOT maintains the statewide roadway inventory database and integrates data owned and supplied by the local agencies.

Ohio
2014

Roadway Safety Data and Analysis Case Study: Safety Analysis in Project Development in Louisiana
The purpose of this case study is to describe the success experienced by the Louisiana Department of Transportation and Development (LADOTD) using safety data and safety analysis techniques in a broad range of project development practices in maintenance, design exceptions, environmental reviews, work zone construction and operations, and local roadway owner coordination.

Louisiana
2014

Wisconsin Information System for Local Roads – Integration of State and Local Safety Data Case Study
This program results in an all-public-roads database using a single LRS and basemap. Local agencies collect and own the data, but the centralized system is available to all authorized users.

Wisconsin
HSM Case Studies
2010

Development of Safety Performance Functions for Network Screening in Illinois
In 2006, the Illinois Center for Transportation, Illinois Department of Transportation (IDOT) and the University of Illinois at Urbana-Champaign performed a research project to develop state-specific SPFs to use in the State’s network screening process.

Illinois
2010 HSM Implementation Plans – New Hampshire DOT Experience
The New Hampshire DOT (NHDOT) developed a roadmap of the State’s current HSM integration status and implementation strategy for a region wide implementation. The roadmap highlights the activities initiated before the release of the HSM, current efforts, and upcoming activities. NHDOT also developed an implementation plan that was approved by executive leadership. (Year 2010)
New Hampshire
2010 Implementing a New Roadway Safety Management Process with AASHTOWare Safety Analyst™ in Ohio
Ohio is one of the States leading the way in the integration of AASHTOWare Safety Analyst™ into state safety programs. The Ohio Department of Transportation (ODOT) is using AASHTOWare Safety Analyst™ to assist with all steps of their safety management system, including: network screening, diagnosis, countermeasure selection, economic appraisal, prioritization, and countermeasure evaluation.
Ohio
2010

Using Predictive Methods for Alternative Selection in Florida
With the publication of the HSM, Florida Department of Transportation (FDOT) initiated a pilot project to investigate the differences in project cost based on FDOT Plans Preparation Manual standards compared to Green Book standards to use as a tool for decision making and alternative selection during the project development process, with specific emphasis on the evaluation of safety costs utilizing the HSM predictive method.

Florida
2010

Using Predictive Methods for a Corridor Study in Idaho
The Idaho Transportation Department (ITD) contracted with a consultant to conduct a comprehensive review of existing Idaho State Highway 8 (Idaho 8) corridor conditions. The review identified deficiencies related to traffic operations, roadway geometry and cross section, access control, and safety with an overall purpose to identify and prioritize operational improvements over a 10-year period. FHWA’s IHSDM was used to evaluate existing traffic, roadway geometry, and predict crashes using these and the corridor’s recent crash history.

Idaho
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