Speed Prediction for Two-Lane Rural Highways

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

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Speed Prediction for Two-Lane Rural Highways

2000-01-01
By Fitzpatrick, Kay ; Elefteriadou, Lily ; Harwood, Douglas W. ; ...

File Language:

English

Details

Creators:

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 Contributors:

United States. Federal Highway Administration. Office of Safety Research and Development ; Texas Transportation Institute ; Turner-Fairbank Highway Research Center
Subject/TRT Terms:

Design Speed Rural Highways Rural Roads--United States--Design And Construction--Evaluation Speed Limits--United States--Evaluation Two Lane Highways
Publication/ Report Number:

FHWA-RD-99-171
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Federal Highway Administration
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.
Format:

PDF
Funding:

DTFH61-95-R-00084
Collection(s):

Federal Highway Administration
Main Document Checksum:

urn:sha-512:9eae5e93ee7fa4857bdf39ef7af72314453b00a951dca755a3abe6ff51fb2696800a5935d75df5d8086b4c9ec1d5d6adafb9dba4b7b28a9c20c2f579e63754ab
Download URL:

https://rosap.ntl.bts.gov/view/dot/41555/dot_41555_DS1.pdf
File Type:

[PDF - 1.03 MB ]

File Language:

English

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