Proposal of an Alternative Model for Speed-Flow Relationship in Two-Lane Highways

A research has been carried out in two-lanehighways in the Madrid Region to propose an alternativemodel for the speed-flowrelationship using regular loop data. The model is different in shape and, in some cases, slopes with respect to the contents of Highway Capacity Manual (HCM). A model is proposed for a mountainous area road, something for which the HCM does not provide explicitly a solution. The problem of a mountain road with high flows to access a popular recreational area is discussed, and some solutions are proposed. Up to 7 one-way sections of two-lanehighways have been selected, aiming at covering a significant number of different characteristics, to verify the proposed method the different classes of highways on which the Manual classifies them. In order to enunciate the model and to verify the basic variables of these types of roads a high number of data have been used. The counts were collected in the same way that the Madrid Region Highway Agency performs their counts. A total of 1.471 hours have been collected, in periods of 5 minutes. The models have been verified by means of specific statistical test (R2, T-Student, Durbin-Watson, ANOVA, etc.) and with the diagnostics of the contrast of assumptions (normality, linearity, homoscedasticity and independence). The model proposed for this type of highways with base conditions, can explain the different behaviors as traffic volumes increase, and follows a polynomial multiple regression model of order 3, S shaped. As secondary results of this research, the levels of service and the capacities of this road have been measured with the 2000 HCM methodology, and the results discussed. © 2011 Published by Elsevier Ltd.

Over-embankment accidents on rural 2-lane conventional highways.

Mode of access: Internet.

Application of positive guidance at a freeway-to-freeway connector in California; an urban location in Dubuque, Iowa; and a two-lane rural site in Washington State. Final report.

Mode of access: Internet.

Horizontal alignment design consistency for rural two-lane highways /

"January 1995."

Passing lanes and other operational improvements on two-lane highways /

"December 1985."

Alternative sign sequences for work zones on rural highways. Executive summary. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

Comparison of signs and markings for passing/no-passing zones. Final report.

Federal Highway Administration, Office of Research, Washington, D.C.

Passing and no-passing zones: signs, markings, and warrants. Final report.

Federal Highway Administration, Traffic Systems Division, Washington, D.C.

Safety cost-effectiveness of incremental changes in cross-section design - information guide.

Turner-Fairbank Highway Research Center, McLean, Va.

An overview of roadway delineation research. Phase III. Final report.

Federal Highway Administration, Washington, D.C.

Study designs for passing sight distance requirements. Final report.

Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.

Evaluation of techniques for warning of slow-moving vehicles ahead: executive summary. Final report.

Mode of access: Internet.

Accidents on spiral transition curves in California. Final report.

Federal Highway Administration, Washington, D.C.

Factors affecting traffic operations on seven-lane cross sections. Final report.

Texas Department of Transportation, Austin

Correlation of design and control characteristics with accidents at rural multi-lane highway intersections in Indiana. Interim report.

Federal Highway Administration, Washington, D.C.