1) A traffic engineering study on traffic delay was conducted at intersections with signals on urban streets. Three type

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1 A Traffic Engineering Study On Traffic Delay Was Conducted At Intersections With Signals On Urban Streets Three Type 1 (113.1 KiB) Viewed 35 times

1) A traffic engineering study on traffic delay was conducted at intersections with signals on urban streets. Three types of traffic signals were utilized in the study: (1) pretimed, (2) semi -actuated, and (3) fully actuated. Five intersections were used for each type of signal. The measure of traffic delay used in the study was the average stopped time per vehicle at each of the intersections (seconds/vehicle). The data follow. Pretimed Semi-actuated Fully actuated 36.6 39.2 30.4 37.1 34.1 17.5 20.6 18.7 25.7 22.0 15.0 10.4 18.9 10.5 15.2 SonTCe W. Reilly, C. Gardner, and J. Kell (1976), A Technique for measurement of delay at intersections. Technical Report. FHWA-RD-76-135, Federal Highway Administration, Office of R & D, Washington, D.C. a. b. c. d. e. f. Write the linear statistical model for this study and explain the model components. State the assumptions necessary for an analysis of variance of the data. Compute the analysis of variance for the data. Compute the least squares means of the traffic delay and their standard errors for each signal type. Compute the 95% confidence interval estimates of the signal type means. Test the hypothesis of no difference among the mean traffic delay of the signal types with the F test at the .05 level of significance.