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EFFECTS OF BECAKS AT SIGNALISED INTERSECTION : a case study in Indonesia

The 7th World Conference on Transport Research,
Sydney, Australia, July 16-21, 1995

Gray literature from JBPTITBPP / 2007-02-14 18:48:04
Oleh : Ofyar Z. Tamin, Prof.Dr.Ir., Department of Civil Engineering (ofyar@trans.si.itb.ac.id)
Dibuat : 1995-07-21, dengan 1 file

Keyword :

Becaks, Signalised intersection, PCU values, Capacity method, Time slice, Multi-Linear-Regression, Saturation flow


Abstract:

The objective of the paper is to show the effects of becaks at signalised intersection in conjunction with their behaviours at intersection. The behaviour will cause the increasing of starting lost time at the beginning of green periods because they obstruct other vehicles to discharge freely. Data was collected from the facility of the research of Indonesian Highway Capacity Manual (IHCM) project. The data was collected from 3 different intersections in Indonesia. The three intersections have different percentage of becaks. All parameters of data used were obtained through analysis of video recording, except the geometric layout and signal timing.

Analysis of PCU values of becak was using the capacity method where the discharge, after the start of green, was calculated separately for each Time Slice and was analysed using Multi-Linear-Regression. The results of PCU values were then used to count and analyse the saturation flow and lost time due to starting delay. From the behaviour of becak in signalised intersections, it was found that 20% to 40% of becaks tried to get to the front of the queue when waiting for green period and nearly half of becak population started moving in green period not in the front of the queue influenced the lost time due starting delay. Approach which have more becaks waiting in the front of the queue have higher lost time because they obstruct other vehicles to be discharged freely in the green periond.

PCU value of becak found in this study is 0.4. It is lower than the value from other researchs, because the intersection under study does not have median and road marking. So that other vehicles could manouvered easily by using opposing lanes. Therefore, the effect of becaks to PCU was low. The average lost time due to starting delay of three intersections is 5.9 seconds. It is quite high compared with other studies. For example, Soegondo et al. (1990) found the lost time due to starting delay is 1.8 seconds, Webster (1966) and Salter (1989) suggest 2.0 seconds for actual practice and IHCM (1992) found the lost itme is 4.8 seconds.

Deskripsi Alternatif :

Abstract:

The objective of the paper is to show the effects of becaks at signalised intersection in conjunction with their behaviours at intersection. The behaviour will cause the increasing of starting lost time at the beginning of green periods because they obstruct other vehicles to discharge freely. Data was collected from the facility of the research of Indonesian Highway Capacity Manual (IHCM) project. The data was collected from 3 different intersections in Indonesia. The three intersections have different percentage of becaks. All parameters of data used were obtained through analysis of video recording, except the geometric layout and signal timing.

Analysis of PCU values of becak was using the capacity method where the discharge, after the start of green, was calculated separately for each Time Slice and was analysed using Multi-Linear-Regression. The results of PCU values were then used to count and analyse the saturation flow and lost time due to starting delay. From the behaviour of becak in signalised intersections, it was found that 20% to 40% of becaks tried to get to the front of the queue when waiting for green period and nearly half of becak population started moving in green period not in the front of the queue influenced the lost time due starting delay. Approach which have more becaks waiting in the front of the queue have higher lost time because they obstruct other vehicles to be discharged freely in the green periond.

PCU value of becak found in this study is 0.4. It is lower than the value from other researchs, because the intersection under study does not have median and road marking. So that other vehicles could manouvered easily by using opposing lanes. Therefore, the effect of becaks to PCU was low. The average lost time due to starting delay of three intersections is 5.9 seconds. It is quite high compared with other studies. For example, Soegondo et al. (1990) found the lost time due to starting delay is 1.8 seconds, Webster (1966) and Salter (1989) suggest 2.0 seconds for actual practice and IHCM (1992) found the lost itme is 4.8 seconds.


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    EFFECTS OF BECAKS AT SIGNALISED INTERSECTION : a case study in Indonesia