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Motorcycle Crash Causation Study Frequently Asked Questions

Q: How can I get the MCCS data?

A: The MCCS data can be requested through the Highway Safety Information System (HSIS) website:

Q: Is there a final report and can I get a copy?

A: The final report and study documentation will be available later in 2017. Please contact Carol Tan ( for further information.

Q:Who paid for the MCCS?

A: The MCCS was primarily funded through the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU). Further funding contributions were made by the National Highway Traffic Safety Administration (NHTSA) and the American Motorcycle Association. In addition, a Transportation Pooled Fund (TPF) Program study was established to enable State and local agencies to contribute additional funds.

Q: What is a TPF Program study?

A: The Transportation Pooled Fund (TPF) Program enables Federal, State, and local agencies and other organizations to combine resources to support transportation research studies. The TPF Program is supported and run through the Federal Highway Administration (FHWA). For more information about the TPF Program, go to

Q: Why were data only collected in California?

A: The study funds only enabled the team to conduct the study in one geographic region. The site selection process went through a thorough review to ensure that the chosen region would include a region with year-round ridership and a large population of motorcycle riders.

Q: How were cases selected?

A: Through memorandums of understanding (MOU), local law enforcement agencies agreed to report all crashes involving motorcycles to the MCCS investigators. The investigators will follow up with evaluations of each case. All no-injury cases will be dropped, per the requirements of the Organisation for Economic Co-operation and Development (OECD) protocol that the team is using as a standard for this study. In addition, the investigators will use other resources to follow up with non-police-reported crashes by utilizing outside sources such as Web or newspaper reports. At an appropriate time, study investigators will review the collection methods to determine whether a stratified sample selection methodology is required to accommodate low-frequency crash types.

Q: How did participants know that their identities were protected?

A: Each participant in the MCCS was given a certificate of confidentiality, which stipulates that members of the MCCS team cannot reveal, nor be forced to reveal, the identities of any participants—not even under subpoena. In addition, all data were stored on secure computers and servers with up-to-date security protection. Any documents collected as part of the investigation process that contained personally identifiable information (e.g., police accident reports) were stored in a secure location until they could be destroyed at the end of the project. No personally identifiable information is included in the permanent databases.