Abstract
This paper represents a Free-flow speed (FFS) parameter that is being used extensively for capacity and level-of-service analysis of various types of highway facilities. As a first effort in the trial of developing local highway standards and guidance for Ramadi city, this study collects and analyzes FFS data at eight roadways in Ramadi city. The objectives of this study are to develop models for estimating average FFS and to set posted speed limit designations. The obtained models reflect the most important variables that govern the FFS,which includevehicle type, speed limit, and shoulder type. A regression model was also developed to predict the relationship between the average running speed (ARS) and the traffic volume. The proposed value of a posted speed limit wasfound to be 80km/h, while the recommended design speed for the Al-Ramadi network is 90km/h.
Keywords
References
- S. Nikiforos, et.al., Analysis of inconsistencies related to design speed, operating speed, and speed limits, KTC-06-12/SPR286-05-1F Research Report, (2007).
- M. D. Deardoff, B. N. Wiesner, J. Fazio, Estimating Free-Flow Speed from Speed Limit Signs, 6th International Symposium on Highway Capacity and Quality of Service, (2011), 306–316.
- A. M. Figuero and A. P. Tarko, Speed factors on two-lane rural highways in free-flow conditions, Transport RES REC 1912 (2005), 46–9.
- K. Fitzpatrick, P. Carlson, M. Brewer, M. Wooldridge, S. Miaou, Design, speed, operating speed, and posted speed practices. Report Submitted to Washington, DC., NCHRP504, (2003).
- Transportation Research Board, National research council highway capacity manual HCM, Washington, D.C., (2010).
- E. T. Donnell, K. M. Mahoney, and J. M. Mason, Conceptual approach to relate design speed, operating speed, and posted speed limits, AB02H0501 Annual Meeting, (2002).
- American Association of State Highway and Transportation Officials, A Policy on Geometric Design of Highways and Streets, (2011).
- Federal Highway Administration, U.S. Department of Transportation, Manual on uniform traffic control devices for streets and highways, Washington, D.C., (2011).
- ITE Technical Committee 97-12, Parma, K., chair, Survey of speed zoning practices, ITE Informational Report, Institute of Transportation Engineers, Washington, D.C., (2001).
Abstract
This paper represents a Free-flow speed (FFS) parameter that is being used extensively for capacity and level-of-service analysis of various types of highway facilities. As a first effort in the trial of developing local highway standards and guidance for Ramadi city, this study collects and analyzes FFS data at eight roadways in Ramadi city. The objectives of this study are to develop models for estimating average FFS and to set posted speed limit designations. The obtained models reflect the most important variables that govern the FFS,which includevehicle type, speed limit, and shoulder type. A regression model was also developed to predict the relationship between the average running speed (ARS) and the traffic volume. The proposed value of a posted speed limit wasfound to be 80km/h, while the recommended design speed for the Al-Ramadi network is 90km/h.
Keywords
References
- S. Nikiforos, et.al., Analysis of inconsistencies related to design speed, operating speed, and speed limits, KTC-06-12/SPR286-05-1F Research Report, (2007).
- M. D. Deardoff, B. N. Wiesner, J. Fazio, Estimating Free-Flow Speed from Speed Limit Signs, 6th International Symposium on Highway Capacity and Quality of Service, (2011), 306–316.
- A. M. Figuero and A. P. Tarko, Speed factors on two-lane rural highways in free-flow conditions, Transport RES REC 1912 (2005), 46–9.
- K. Fitzpatrick, P. Carlson, M. Brewer, M. Wooldridge, S. Miaou, Design, speed, operating speed, and posted speed practices. Report Submitted to Washington, DC., NCHRP504, (2003).
- Transportation Research Board, National research council highway capacity manual HCM, Washington, D.C., (2010).
- E. T. Donnell, K. M. Mahoney, and J. M. Mason, Conceptual approach to relate design speed, operating speed, and posted speed limits, AB02H0501 Annual Meeting, (2002).
- American Association of State Highway and Transportation Officials, A Policy on Geometric Design of Highways and Streets, (2011).
- Federal Highway Administration, U.S. Department of Transportation, Manual on uniform traffic control devices for streets and highways, Washington, D.C., (2011).
- ITE Technical Committee 97-12, Parma, K., chair, Survey of speed zoning practices, ITE Informational Report, Institute of Transportation Engineers, Washington, D.C., (2001).
Details
| Subjects | Engineering |
|---|---|
| Journal Section | Articles |
| Authors | |
| Publication Date | November 1, 2013 |
| Published in Issue | Year 2013 Volume: 10 Issue: 2 |