DAVIDSON'S LOS FACTOR FOR AN INTERURBAN ROAD

• Main Author: ILLYANTO
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2099
• Institution: Institut Teknologi Bandung

DAVIDSON'S LOS FACTOR FOR AN INTERURBAN ROAD, Illyanto, 1999, Program Magister Sistem dan Teknik Jalan Raya, Program Pascasarjana, Institut Teknologi Bandung. Davidson (1966) derived a relationship between travel time and flow based on microscopic queuing theory. Travel time is influenced by flow, zero flow travel time, capacity, and a level-Of service factor. The level of service factor by Davidson is called parameter J, which is a measure that indicates the comfort and safety when passing over the road. This factor is influenced by road width, pavement type, geometry of road, and side friction. The objective of this study is to determine Davidson's LOS factor on an interurban road at different road widths and directional splits. The road widths are 10 m at km 4 and 7 m at km 10 from Cianjur in direction Padalarang. The vehicles are classified into light vehicles (LV), medium heavy vehicles (MHV), large trucks (LT), large buses (LB) and motor cycles (MC). The data were collected by manual identification on video images of long base observations. The time of survey was divided into three periods, i.e. 06. 00-08.00 in the morning, 11.00-13.00 around noon and 15.30- 17.30 in the afternoon. The capacity and free flow speed were obtained by linear regression for the speed-density relationship. The analysis process was done with intervals of two, four and six minutes for each directional split to identify the best interval. Then the value of parameter J was obtained by finding the best fit to the data points. The parameter J for location of 10 m and 7 m road widths were found to be similar, which indicate that the effective road width must be similar. For direction to Padalarang the location with 10 m road width produced parameter J values of 0.078 to 0.328, and the location with 7 m road width 0.060 to 0.299. For direction to Cianjur the location with 10 m road width produced parameter J values of 0.078 to 0.323, and the location with 7 m road width 0. 079 to 0.348. The parameter J for each direction and each location were also found to be similar. For direction to Padalarang the location with 10 m road width produced parameter J values of 0.078 to 0.328, and for direction to Cianjur 0. 078 to 0.323. For direction to Padalarang location with 7 m road width produced parameter J values of 0.060 to 0. 299, and for direction to Cianjur 0.079 to 0.348. The parameter J for D.40 are 0.299 to 0.348 which are higher than those for D.50 (0.083 to 0.191) and these are in turn higher than those for D.60 (0.060 to 0.079).