| Title | Research Utilizing SHRP2 Data to Improve Highway Safety: Development of Speed—Safety Relationships |
|---|---|
| Record ID | 73711 |
| Personal Name Creator |
Hutton, Jessica M.; Cook, Daniel J.; Grotheer, J.; Conn, M. |
| Personal Name Contributor |
Mohamedshah, Yusuf M. |
| Corporate Creator | United States. Federal Highway Administration. Office of Safety Research and Development |
| Corporate Contributor |
MRIGlobal (Firm); Turner-Fairbank Highway Research Center |
| Publisher | United States. Federal Highway Administration. Office of Safety Research and Development |
| Publication Date | 20200401 |
| Language | English |
| Abstract | The objective of this research was to examine the link between driving speed and crash experience on roadway segments, taking into account roadway characteristics that influence speed and crash frequency and severity. A potential outcome of the research was improved safety performance functions that included a speed term or crash modification factors (CMFs) based on speed for use in a safety-prediction methodology for urban/suburban arterials. Using the second Strategic Highway Research Program Naturalistic Driving Study data and the Roadway Inventory Database (RID), the research examined individual drivers' speeds along 100 study segments. Variations within individual trips as well as among drivers on the same roadway segment over a few years were evaluated. Also, using the RID and roadway and roadside characteristics obtained from aerial and street-view imagery, relationships between speed choice and roadway characteristics were explored. The research found that a number of roadway characteristics are related to speed and crash experience for a roadway segment and that a higher measure of speed variance between trips was frequently correlated with higher crash frequency (especially for multivehicle crashes). Most other speed measures evaluated had no correlation with crash frequency or had a negative correlation. The research did not find that including a speed term into existing safety performance functions or developing a speed CMF would substantially improve the existing crash-prediction methodology for urban and suburban arterials presented in the Highway Safety Manual. |
| Rosap ID | dot:44448 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/44448 |
| TRT Terms | Highway safety; Strategic planning; Crash modification factors; Crash data; Arterial highways |
| General Subjects | Highway safety; Suburban arterial; Speed; Crash modification factor; Urban arterial; Crash data; Naturalistic driving; Roadway inventory data |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1736321 |
| Contract Number | DTFH61-16-C-00005 |
| Report Number | FHWA-HRT-20-035 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/73000/73700/73711/FHWA-HRT-20-035.pdf |
| Format | |
| Database | NTL Digital Repository |