Traffic engineers frequently are engaged in evaluating the performance of
different facilities of the highway system. The facility in this project includes freeway
section. In design of a freeway, a forecast demand volume is used with known design
standards for geometric features and a desired level of service to compute the number
of lanes required for the freeway section in question. The design application is straight
forward for each usage, but trial-and- error operation analysis may be required to
evaluate alternative design. Design requires a detailed traffic forecast, including
volumes, peaking characteristics, traffic composition, and specifics of vertical and
horizontal alignment for the section under study.
The aim of this paper is the design analysis of a freeway with a heavy
recreational vehicles. This analysis involves the consideration of three examples of
freeways. Given known geometric roadway conditions and projected traffic conditions
, the design analysis yields an estimation of the number of lanes and of the speed and
density of the traffic stream. This paper has described the procedure for determining
the number of lanes of freeway basic sections as presented in the Highway Capacity
Manual (HCM, 2000) and HCS2000 software.