Our office has been working as the technical experts for implementing the Highway Safety Manual (HSM). As part of the implementation process, we are working towards incorporating the HSM methodology into the Highway Safety Program (HSP) Project Selection Process, the HSP Prioritization methods, Part D Crash Modification Factors, and Roadway Engineering Design Exceptions.
In 2011, Ohio was one of the first states in the country to fully implement Safety Analyst and used it to prioritize safety locations across Ohio. Safety Analyst uses state-of-the-art statistical methodologies to identify roadway locations and safety improvements with the highest potential for reducing crashes based on information contained in the HSM Part B. The software system flags spot locations and road segments that have higher-than-predicted crash frequencies. It also flags locations for review based on crash severity. This methodology is more efficient and cost effective and will allow the department to study fewer locations yet target more crashes per mile studied. Click the link below for the current Highway Safety Program Priority List.
During 2009 and 2010, Dr. Karen Dixon, Principal Investigator of NCHRP 17-38, developed three spreadsheets in a volunteer effort to support training efforts on the first edition of the HSM. Update versions of these spreadsheets were funded through a partnership between the Alabama Department of Transportation and Virginia Department of Transportation. These agencies released these tools for use by other individuals and agencies to support the implementation of the HSM across the nation.
The Ohio Department of Transportation (ODOT) reviewed the previous spreadsheets for their operation and calculation methodology. Based on the needs of ODOT, a single spreadsheet was created to complete the HSM calculations. The Economic Crash Analysis Tool (ECAT) has the ability to calculate predicted crash frequencies, complete empirical bayes calculations, predict crash frequencies for proposed conditions, conduct alternatives analyses, and complete a benefit-cost analysis.
Currently, the tool will be used as one scoring method during the April 2014 funding round. A PDF of the future enhancements and updates will be maintained below. With any new tool, errors will occur and these will be corrected and uploaded as time permits. When starting a new project please return to this website to obtain the latest version. Please contact Derek Troyer (firstname.lastname@example.org) with comments or questions. Official training dates will be posted in the future and be conducted through webinar style.
We have updated the Rate of Return (ROR) Tool and Crash Analysis Module (CAM) Tool as of August 2012 to incorporate Crash Modification Factors (CMF) / Crash Reduction Factors (CRF) from the HSM Part C and Part D. We will still accept CRF's from the previous CAM Tools and ROR Tools for the Fall 2012 funding round. Click the link below for the FHWA CMF Clearinghouse.
The Division of Engineering
is in charge of design exception process and methodologies. A design exception is the formal documentation of the justification to deviate from the established design criteria. The controlling criteria which requires a design exception are lane width, shoulder width, bridge width, structural capacity, horizontal alignment, vertical alignment, grade, stopping sight distance, cross slope, superelevation, vertical clearance and horizontal clearance. The goal is to have the design exception process updated by the beginning of 2013.