Computer simulation techniques and their applications to trafficoperations have gained popularity in recent years. The traffic experimental and analysis simulation (texas) computer model is a prime example. This model was developed to be used as a tool to evaluate traffic performance at isolated intersections operating under various types of intersection control. The objective of this study was to assess the ability of the texas model in simulating isolated signalized intersections. This assessment was conducted using field data. Eight intersection conditions were used for data collection. Existing field data were obtained from previous studies and supplemented with more data collection where needed. Critical 10-min time periods werechosen for the simulation runs, and the average stopped delays obtained from simulation were compared with the observed stopped delay data. Statistical tests were conducted; the results indicated that inmost of the intersection conditions no significant difference was observed for through traffic. However, significant differences between field and simulated results were achieved for left-turning traffic. These findings were limited to eight intersection conditions studied in arizona, and it suggests that the user of the model is advisedto carefully assess the default variables embedded in texas. This paper appears in transportation research record no. 1320, Freeway operations, highway capacity, and traffic flow 1991.
Samenvatting