M.Sc Thesis
M.Sc Student Nisreen Zrourr Analysis and Evaluation of the Methodology to Determine Level-of Service and Flow Characteristics on Two-Lane Highways Department of Civil and Environmental Engineering Full Professor Polus Abishai

Abstract

The determination of the Level-of Service (LOS) on the two-lane rural highways is very significant and complex subject. The reasons of this complexity due to the factors that affect this determination. For example, the Geometric Data, the Demand Volume, the Opposing Traffic and the Passing Lanes.

The objectives of this Final Paper were based on the assessment of the advantages and disadvantages of the existing methods that evaluate the Level of Service on the two-lane highways. A thorough literature review was conducted to identify the lacks and the limitations of these methods. One of the very important methodologies is the Highway Capacity Manuel (HCM 2000). The HCM 2000 presents an analysis methodology for two-lane highways.

Traffic Flow data have been collected from 15 Two-Lane Highways in Israel (number of vehicles, number of Trucks, Travel Speeds and time, and Headways).  Five highways Flow data were collected in 2004, and the others ten highways in 2007. the flow data were collected from both travel directions.

The volumes and the portion of trucks were found for the 15 highways. There was also some Statistical computation for some of the Parameters: Travel Speeds in and out of platoons, the travel Leader platoon’s Speed, the length of Platoons without the first vehicle, the number of vehicles that travel between platoons, the platoon Headways and the non platoon Headways.

The range of the 30 segments’ volumes was from 137-1173 vehicles per hour. The range of portion of the trucks was from 2.01%-10.79%. The average of the vehicles those travel between platoons lower than the average of the vehicles those travel in platoons. The Percent Time Spent Following values of the 30 segments, that gives the Polus-Pollatschek method, are, on the average lower than the Percent Time Spent Following values that give the HCM 2000 Procedures. Due to the Percent Time Spent Following values No segments are found in “A” Level of Service, seven segments in “B” Level of Service, fifteen segments in “C” Level of Service and eight segments in “D” Level of Service. In 76% of segments the degree of traveling was more than 50%.

It is recommended:

1. To develop a new methodology that taking into account the intersection and the signalized intersections.
2. To do a closely study that dealing with the effects of  No-Passing Zones, Directional Split, type of terrain, and the influence of the opposing flow.