DEVELOPMENT OF A COMPUTER PROGRAM FOR ANALYSING CUMULATIVE OVERSATURATION OF A SIGNALISED INTERSECTION

• Main Author: Khalidin
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/1514
• Institution: Institut Teknologi Bandung

<b>ABSTRAK:</br></b> <br /> <p align=\"justify\">DEVELOPMENT OF A COMPUTER PROGRAM FOR ANALYSING CUMULATIVE OVERSATURATION OF A SIGNALISED INTERSECTION , Khalidin, 1998, Program Magister Sistem dan Teknik Jalan Raya, Program Pascasarjana, Institut Teknologi Bandung. In heavy traffic, isolated intersections controlled by signals are usually over-saturated. Oversaturated conditions can occur on one or more approaches, or on all approaches during a cycle. This research developed a computer program that determines the delay and predicts the overflow perapproach and per-cycle for both over-saturated and under-saturated conditions. The program called KRNRA requires data input of traffic flow, total lost time, approach width and maximum cycle time. The overflow at the previous cycle is recorded and counted as a data entry in the next cycle. The data used was collected from the Pasir Kaliki-Pasteur intersection in Bandung. The measured traffic flow passing the stop line was used in different ways: it was simulated by random numbers, and also with sensitivity analyses it was increased by 5% and 10%, and reduced by 5%. To validate the predicted overflows using the KRNRA program, field observations were made by video camera. <p align=\"justify\">The maximum limit cycle times used to determine the delays and overflows were 150, 155, 160 and 170 seconds respectively and was executed for 45 consecutive cycles. The minimum delay obtained was 118.69 seconds per pcu at a maximum cycle time of 155 seconds by using existing traffic flows. The minimum delay obtained was 41.45 seconds per pcu at a maximum cycle time of 150 seconds by reducing 5t and 150.11 seconds per pcu at a maximum cycle time of 160 seconds by increasing 5%. The minimum delay obtained 170.28 seconds per pcu at a maximum cycle time of 155 seconds by increasing 10%. The delay minimum obtained 110.60 seconds per pcu at a maximum cycle time of 160 seconds by simulation. Overflow validation used a maximum cycle time of 170 seconds because it was observed the maximum cycle time displayed. Overflow validation was available only at the west, north and south approaches, it was 130 pcu, 137 pcu and 191 pcu respectively. Observed overflows were 169 pcu at west, 194 pcu at north and 238 pcu at south approaches. The east approach could not be validated because of the horizontal alignment. The values from the KRNRA program are smaller than those observed. This would be expected because the KRNRA program was run with the observed stop line traffic flow instead of the demand flow.