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Specialties & Experience of this Expert Witness

General Specialties:

Civil Engineering and Safety

Keywords/Search Terms:

Trucking, Guardrail, Barrier, Highway Design, Highway Safety, ISPE, Bridge railing, Traffic Safety, Cable Barrier, Concrete Barrier, Guardrail ends/terminals, Traffic engineering, Construction Engineering, Traffic control, tree crash, pole crash, Highway construction, Run off road crash


PhD, Worcester Polytechnic Institute; MS, Worcester Polytechnic Institute; BS, Worcester Polytechnic Institute

Years in Practice:


Number of Times Deposed/Testified in Last 4 Yrs:


Additional Information

Experienced expert. Licensed in more than 15 States. Award winning roadway safety thought leader. Has conducted numerous research projects involving road safety. Widely published in peer reviewed literature. National and international speaker on roadway safety. Serves on key national committees dealing with roadway safety. Hands-on experience designing a wide variety of highway and intersection improvements. Registered professional engineer in more than fifteen states. PhD in Civil Engineering with a focus on highway safety from Worcester Polytechnic Institute. Dr. Carrigan formed a research consulting business with two partners in 2010 and has subsequently been almost exclusively focused on roadside and highway safety research. Dr. Carrigan has or is currently conducting research funded by the National Academy of Science’s National Cooperative Highway Research Program (NCHRP), the Federal Highway Administration (FHWA), and a variety of other government and industry sponsors. Dr. Carrigan has developed design guidance for inclusion in publications such as the AASHTO Roadside Design Guide and the AASHTO LRFD Bridge Specification. She has developed models for quantifying crash frequency and severity for inclusion in the AASHTO Highway Safety Manual. Dr. Carrigan co-authored NCHRP Report 892 providing guidance for shielding bridge piers and NCHRP WO Document 307 which provides guidance for the selection of bridge rails. She co-authored NCHRP WO Document 292 which provides guidance for replacing roadside hardware and documented the FHWA study on the in-service performance of terminals. Dr. Carrigan is the lead author of NCHRP Report 996 on the selection and placement of median and roadside barriers. She is a co-author of NCHRP Report 972 which updated the guidance available through the AASHTO Roadside Design Guide. Dr. Carrigan is the lead author of NCHRP Report 1010 which provides guidance for evaluating the field performance of roadside hardware and is currently the principal investigator for several related NCHRP projects on the field performance evaluation of roadside hardware. Dr. Carrigan is a member of the Transportation Research Board Committee on Roadside Design. She is the chair of the In-Service Performance Evaluation (ISPE) subcommittee. Dr. Carrigan is the past-president of the Maine Society of Professional Engineers and is a registered professional engineer the States of Arizona, Connecticut, Florida, Hawaii, Illinois, Indiana, Maine, Massachusetts, Mississippi, New York, New Mexico, North Carolina, Ohio, South Carolina, Texas, Washington, and West Virginia.