Citation

Polus A, Livneh M, Craus J. Transp. Res. Rec. 1984; 960: 34-39.

Copyright

(Copyright © 1984, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

The objective of this study was to deal with two-lane rural highways and the effect of their geometry on flow characteristics. Several design measures that represent road geometrics and traffic were developed. The layout measures that were adopted as independent variables for the suggested models represented the horizontal and vertical alignments; they were the average curvature, average hilliness, and net gradient. The traffic parameters considered were the volume, density, and percentage of trunks, and directional distribution of traffic. Based on tests of several alternative functional forms, it is demonstrated that multiple linear-regression models may be used for prediction of the average running speed on two-lane rural highways. It is also demonstrated that either volume or density can serve as independent traffic parameters along with the percentage of trucks and directional distribution of traffic. The calibration of results of the models is presented and evaluated. Calculations of two-way rural highway capacity trends for level, hilly, and mountainous terrains indicate that the values obtained are less sensitive to percentage of trucks than are currently recognized capacity values. The suggested capacities are also higher than the current values, particularly for the upper percentage range of trucks.

Record URL:
http://onlinepubs.trb.org/Onlinepubs/trr/1984/960/960-005.pdf

Language: en

Keywords

MATHEMATICAL MODELS; HIGHWAY TRAFFIC CONTROL; HIGHWAY ENGINEERING