الفهرس 
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Abstract
Literature review revealed that there are no accurate models that describe the relationship between traffic steam parameters on intercity roads in Egypt. Therefore, the main objective of this research is to develop relationships between the main characteristics that describe the traffic stream through intercity roads in Egypt. These relationships are used in planning, designing and operation of transportation facilities.
Traffic data of flow rate, speed, and density was collected from three study sections in Cairo-Ismailia desert road and Cairo-Suez desert road, using video-based measurement technique. Before actual field data collection, an investigation was done to help in visualizing the best position for the camera. A pilot survey was performed to detect any mistakes that may affect data collection. Traffic data was collected during typical weekdays: Monday and Wednesday, in addition to Thursday where the traffic is more congested than any normal day. Samples were recorded in different times of the day to represent all conditions of traffic flow on the selected roads sections.
Video tapes were processed by tracing vehicle by vehicle movement while crossing the specified section. The flow, space-mean speed, time-mean speed, and density were calculated using the recorded data from video tapes. Using the collected traffic data, the following relationships were developed:
1. Relationship between time-mean speed and space-mean speed
2. Relationship between space-mean speed and density
3. Relationship between flow rate and density
4. Relationship between flow rate and space-mean speed
Different types of single and multi-regime models have been checked. Two criteria have been followed to differentiate between these models: statistical tests and logic of the output parameters. Based on these criteria, three-regime statistical models were found the best models to describe the relationships among the different traffic stream characteristics. Analysis of these models showed that the jam and optimum densities are 167.77 and 61.72 pcu/km/lane respectively, the free-flow and optimum speeds are 109.58 and 28.08 km/hr respectively, and the lane capacity is about 1732.9 pcu/hr/lane.