| Title | Speed Prediction for Two-Lane Rural Highways |
|---|---|
| Record ID | 67086 |
| Personal Name Creator |
Fitzpatrick, Kay; Elefteriadou, Lily; Harwood, Douglas W.; Collins, Jon M.; McFadden, John; Anderson, Ingrid B.; Krammes, Raymond A.; Irizarry, Nelson; Parma, Kelly D.; Bauer, Karin M.; Passetti, Karl |
| Corporate Contributor |
United States. Federal Highway Administration. Office of Safety Research and Development; Texas Transportation Institute; Turner-Fairbank Highway Research Center |
| Publisher | United States. Federal Highway Administration |
| Publication Date | 20000101 |
| Language | English |
| Abstract | Design consistency refers to the conformance of a highway’s geometry to driver expectancy. Drivers make fewer errors in the vicinity of geometric features that conform to their expectations. A technique to evaluate the consistency of a design is to evaluate changes in operating speeds along an alignment. To use operating speed as a consistency tool requires the ability to accurately predict speeds as a function of the roadway geometry. In this research project, several efforts were undertaken to predict operating speed for different conditions such as on horizontal, vertical, and combined curves; on tangent sections using alignment indices; on grades using the TWOPAS model; and prior to or after a horizontal curve. The findings from the different efforts were incorporated into a speed-profile model. The model can be used to evaluate the design consistency of the roadway or can be used to develop a speed profile for an alignment. The model considers both horizontal and vertical curvature and the acceleration or deceleration behavior as a vehicle moves from one feature to another. |
| Rosap ID | dot:41555 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/41555 |
| TRT Terms | Design speed; Two lane highways; Rural highways |
| General Subjects | Rural roads--United States--Design and construction--Evaluation; Speed limits--United States--Evaluation |
| Geographical Coverage |
United States |
| Contract Number | DTFH61-95-R-00084 |
| Report Number | FHWA-RD-99-171 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/67000/67000/67086/99171.pdf |
| Alternative URL | https://www.fhwa.dot.gov/publications/research/safety/ihsdm/99171/99171.pdf; https://www.fhwa.dot.gov/publications/research/safety/ihsdm/99171/ |
| Format | |
| Database | NTL Digital Repository |