04074nam a2200409 4500 20260818090418.0 190698 th eng .b11632847 AIT Thesis no. TE-96-04 Mathetharan, Vijayarajah Determination of highway capacity on uninterrupted flow highway Bangkok : Asian Institute of Technology, 1997 140 p.: ill. Thesis ; no. TE-96-04 Thesis (M.Eng.) - Asian Institute of Technology, 1996 A thesis submitted in pa1iial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering Accurate knowledge of the current operational traffic behavior inevitably enhances the reliability of planning and design of the highway facilities. The use of an accurate value of basic capacity is necessary in calculating service flow rates which are the close representatives of traffic behavior. This study was canied out as a stepping stone towards the determination of the basic capacity of uninterrupted flow highway facilities in Thailand. Speed-flow-density analysis was used as primary methodology to determine the capacity. Average speed difference distribution method and average minimum time headway approach were used as benchmark tests. A photographic technique through video recording was used to collect relevant data from one of the busiest expressways in Thailand, namely the Chalerm Maha Nakhon Expressway. The data were extracted manually from the recording. The extracted data were analyzed to find the key variables such as speed, flow and density and other necessary parameters such as headway and passenger car equivalents (PCE) which are used to find the focal point, the capacity. Seven appropriate mathematical models which relate speed, flow and density were hypothesized and then calibrated to find the functional fit to the collected data. The graphical representation of models with different curves were analyzed in detail. The analyses were carried out on a separate lane basis and on a combined average lane basis. The analyses were done separately on data acquired in 5-min and 15-min intervals. The capacity values for different cases were found using the calibrated model expressions and graphical representation of models. The average value of capacity for uninterrupted flow highway based on the speed-flowdensity approach was found to be about 2400 passenger cars per hour per lane (pcphpl). This obtained capacity value is 16.67% higher than the value of 2000 pcphpl currently used in Thailand. Moreover, the value is 9 .17% higher than the benchmark value previously obtained by using minimum time headway approach in Thailand. However, the obtained capacity value is in concordance with the value that the Highway Capacity Manual (HCM) predicts. Highway capacity Yordphol Tanaboriboon, Chairperson Morisugi, Hisa, Examination committee Chen, Jian-Shiuh, Examination committee The Government of Japan, Scholarship donor Asian Institute of Technology. Thesis ; no. TE-96-04 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B14177 .b11632847 mnait s 240402 0 970902 m a s 0 mnait mnait mnarc 20 40 Barcode : 30050120817589 CREATED : 1997-02-09 RECORD # : i11989889 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120817571 CREATED : 1997-02-09 RECORD # : i11989890 LPATRON : 1015034 LCHKIN : 2004-03-27 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 6 TOT RENEW : 1 Barcode : 30050160014758 CREATED : 2016-03-22 RECORD # : i12902123 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 28002 28002 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. TE-96-04 30050120817589 2026-08-18 09:04:18 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. TE-96-04 30050120817571 2026-08-18 09:04:18 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. TE-96-04 30050160014758 2026-08-18 09:04:18 1 2026-08-18 40