טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentLior Bar
SubjectTraffic Flow Characteristics and Capacity on Freeways
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Full Professor Polus Abishai


Abstract

Freeway analysis of capacity, delay and level of service are conducted regularly by traffic engineers, for peak periods, in order to determine such issues as the level of service and the needed number of lane. The purpose of the reasearch is to evaluate the values of capacities and its behavior during peak periods and to determine other flow 

characteristics such as trucks flow, lane distribution, occupancies and speeds. These characteristics are needed to evaluate and analyze the dynamic changes in the traffic conditions and thus to assist in congestion mitigation and improve traffic flow safety.

 The methodology of the analysis was based on analyses of data that was obtained from the Ayalon Highways company for three road sections: Keren Kayemet, Rokach and Hahalacha on the freeway south bound. The data consisted of speeds, flow and occupancies and headways for 3 full days. The first section was a basic freeway section, the second was a transition section and the third was a weaving section.


Flow Rate-Speed data performance for all day of measurements and all site showed that the data distribution is reasonably consistent with basic shape of a Flow Rate-Speed curve. Two flow regimes are clearly observed in the Flow Rate-Density plane: the free flow regime and the congested flow regime .In the Density-Speed plane it was been found that there was two flow regimes, one is the low density and high speed and the ather is high density and low speed. In the Occupancy-Flow Rate plane a parabolic curve has been found, but its value of capacity was lower then in the Flow Rate-Speed plane.