photo of a car with headlights shining driving down a road

Session No. 2C

Session Title: IHSDM/HSM

Session Description: In 2010, the American Association of State Highway and Transportation Officials (AASHTO) published the first edition of the Highway Safety Manual (HSM). The HSM provides safety knowledge and tools in a useful form to facilitate improved decision making based on safety performance. The HSM procedures have become accepted as best practice. Agencies are using HSM procedures on projects in various ways to inform decisions, and various tools have been developed to facilitate the use and implementation of HSM procedures. This session will discuss the use of two tools that implement HSM procedures: the Interactive Highway Safety Design Model (IHSDM) and ISATe. IHSDM is a suite of software analysis tools used to evaluate the safety and operational effects of geometric design decisions on highways. IHSDM is the most complete and efficient tool available for performing data-driven safety analyses for specific project sites and faithfully implements HSM Part C predictive methods. In this session two recent projects in Pennsylvania will be presented that used IHSDM to evaluate design alternatives. IHSDM was used on an integrated corridor management project covering 13 miles of I-76 between the Pennsylvania Turnpike and US Route 1 in Montgomery County as well as the parallel and intersecting arterials. IHSDM was also used to evaluate design alternatives along a section of I-83 near Harrisburg that was recently reconstructed and widened between the Susquehanna River and the 29th Street Bridge. The final presentation will discuss PennDOT’s recent efforts to calibrate freeway and ramp crash prediction models, specific to Pennsylvania conditions, and describe how the calibrated models can be use within the ISATe spreadsheet tool to assess safety performance along freeways and ramps in Pennsylvania.

Moderator: Darren Torbic, MRIGlobal


Speaker Bios

Brian DePan, P.E. is a Project Manager in Jacobs’ Philadelphia Traffic/ITS Group. In his 13 years at Jacobs, DePan has assisted public-sector clients in ITS design and construction support, network design, operations planning, TMC and software design/implementation, asset management, and traffic modeling and analysis.  DePan is a licensed professional engineer in Pennsylvania and Delaware and holds engineering degrees from the University of Delaware (BS) and Villanova University (MS).

Melissa Mo has two bachelor's degrees from Drexel University in Civil and Architectural Engineering. In the past three years since graduating she has worked on a variety of different projects including streetscape and signal design, safety analysis, and lighting design for the City of Philadelphia and PennDOT.

Chris Deats is a transportation engineer based out of Harrisburg, Pennsylvania with more than 15 years of experience in civil design. Notable projects include the American Parkway Roadway Design, SEPTA Lansdale Parking Garage, and the NMDOT Railrunner extension. Deats holds a Bachelor of Science in Engineering from The Pennsylvania State University and a B.S. in Physics from Juniata College.

Pete Jenior is a traffic engineer with Kittelson & Associates in Baltimore. He leads projects with agencies throughout the Mid-Atlantic. Jenior led Kittelson’s efforts to calibrate the HSM Freeway and Ramp models for Pennsylvania, and he has instructed PennDOT’s 1.5 day HSM Workshop a dozen times. Jenior has also performed roundabout work for PennDOT Central Office for a decade.

Benjamin Brubaker, P.E., P.T.O.E. is a Senior Traffic Engineer at Michael Baker International in Harrisburg. Brubaker is a licensed professional engineer in Pennsylvania and has a Bachelors of Civil Engineering from the University of Delaware. Brubaker has an extensive background in traffic engineering, safety engineering, and traffic signal design and has worked closely with various private and public-sector clients. He served as the lead consultant to PennDOT during the completion of the Statewide highway safety network screening of arterial roadway sections and intersections. Brubaker was also involved with the Freeway and Ramp HSM calibration for Pennsylvania.

Jason Hershock is a 2001 graduate of Penn State. Over the last 19 years Hershock has worked for the Army, as an engineering consultant, PennDOT’s District 8-0 office and Central office. Most of his career with PennDOT has been in traffic and highway safety. Hershock currently manages the Safety Engineering and Risk Management Unit in PennDOT’s Highway Safety & Traffic Operations Division (HSTOD). He manages Pennsylvania’s HSM implementation along with the HSIP, LCSIP, Risk Management programs. He serves as a member to national pooled fund study groups which include the Evaluation of Low Cost Safety Improvements, TPF-5(317), and the Highway Safety Manual Implementation pooled fund group, TPF-5(255). Hershock is a current member of the AASHTO HSM2 steering committee.




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Wednesday, December 11, 2019

3:30 to 5:00 p.m.

Room 106

Note: Select presentations are available in PDF format for download by clicking on the highlighted link for each title. If a link is not shown, the presentation was too large to be uploaded to the website.  




The Transportation Engineering and Safety Conference (TESC) attracts professionals from throughout Pennsylvania, the mid-Atlantic region, and the country. It is an authoritative source of information on pressing issues from some of the foremost experts in transportation today.

Thomas D. Larson Pennsylvania Transportation Institute

201 Transportation Research Building

The Pennsylvania State University

University Park, PA 16802-4710

Phone: 814-865-1891