Published at : 28 Jan 2019
Volume : IJtech
Vol 10, No 1 (2019)
DOI : https://doi.org/10.14716/ijtech.v10i1.2281
Sony Sumaryo | School of Electrical Engineering, Telkom University, Jl. Telekomunikasi Terusan Buah Batu, Bandung 40257, Indonesia |
Kalamullah Ramli | Department of Electrical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia |
Abdul Halim | Department of Electrical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia |
Endra Joelianto | Instrumentation and Control Research Group, Faculty of Industrial Technology, Institute Technology of Bandung, Ganesha 10, Bandung 40132, Indonesia |
Intelligent Transportation System (ITS) is the synergy of information technology, real-time control, and communication networks. The system is expected to perform more complex traffic arrangements, in particular, traffic management of Emergency Vehicles (EV) such as fire trucks, ambulances, and so forth. Implementation of traffic management using only Traffic Signal Pre-emption does not give enough space for an EV to cross an intersection safely, especially on streets where there is only one lane. This paper proposes a model of accelerated emptying of traffic in front of EVs. Accelerated emptying model uses historical approach, based on current characteristics of traffic. For example, if the normal vehicle speed is equal to the EV speed before accelerated emptying, the system indicator will be 0%, thereby indicating no need for accelerated emptying. Similarly, a negative system indicator result means an accelerated emptying process is not necessary. However, if the system indicator is close to 100%, this result indicates accelerated emptying is necessary.
Acceleration discharge; Emergency vehicle; Historical data; Model
Researchers around the world have concerned themselves with how to efficiently exploit capacity of the existing transportation infrastructure (Sumaryo et al., 2014). Intelligent Transportation System (ITS) was proposed to solve traffic problems; it consists of information technology, real-time control, and network communications. ITS researchers have received considerable attention worldwide, including: Kim and Mahmassani (2015); Lim (2016); Lopez-Garcia et al. (2016); Loorbach and Shiroyama (2016); Mannion et al. (2016); Hassn et al. (2016).
The transportation system is a complex and dynamic system that is difficult to model with precision (Li et al., 2007). However, without proper modeling, characteristics of the transportation system cannot be properly identified for the purpose of evaluating existing methods and identifying potential problems.
Traffic flow modeling, using queuing theory, has been performed by numerous experts (Yang & Yang, 2014; Fuyu et al., 2014; Sumaryo et al., 2015).
Figure 1 The example of pre-emptive detection of EV
However, implementation using only traffic signal pre-emption is not enough to give adequate space for an EV to cross an intersection safely. Therefore, additional processes are necessary, such as accelerating the discharge of vehicles in front of the EV. Discharging congestion in front of EVs is crucial, especially if the road has only one lane.
Most experts have only briefly considered emptying vehicle congestion in front of EVs (Huang et al., 2011; Kamalanathsharma, 2010; Wang et al., 2013). Until now, studies have not examined means of promptly reducing lane traffic congestion in front of EVs. In 2011, the procedure proposed by Huang, Yang and Ma identified a need for accelerated discharging at a vulnerable position of congestion. However, the research did not develop a process for emptying. In 2010, Kamalanathsharma’s research only identified the time required by the last vehicle in the queue to reach the intersection. While this did provide a basis for determining the pre-emptive offset, again the research lacked further development of an emptying process. Likewise, the research conducted by Wang et al. (2013) predicted the time required for emptying the queue based on queue history, but their approach did not guarantee the avoidance of collision to a normal vehicle in front of the EV by the EV.
This research was aimed to develop a method and model for accelerated discharging of traffic in front of an EV at a single intersection. Accelerated discharging is the process of emptying a queue of normal vehicles immediately in front of the EV at the arm of the intersection. The method developed by Wang et al. (2013), is a pre-emptive extension system called TONGJI-Signal Emergency Vehicle Pre-emption System (TJ-EVSP) that can be applied to other pre-emptive systems. The proposed method and model of accelerated emptying presented here follows an historical approach. The tail of the queue path does not intersect with the trajectory of the EV across the intersection. The simulation test of the accelerated emptying model was conducted using MATLAB.
This paper proposed an accelerated emptying of lane traffic to facilitate access for EVs using an historical approach method that applied past characteristics of traffic. Using the proposed model, the emptying process can be analyzed using the defined system indicator. The results showed that, where the normal vehicle speed before accelerated emptying was the same as the EV speed, the system indicator was at zero percent, thereby indicating no requirement for accelerated emptying. The same results arose for the negative indicator. However, where the system indicator was close to one hundred percent, requirement for the accelerated emptying process was necessary.
Publication of the
article was supported by the United States Agency for International Development
(USAID) through the Sustainable Higher Education Research Alliance (SHERA)
Program for Universitas Indonesia’s Scientific Modeling, Application, Research
and Training for City-centered Innovation and Technology (SMART CITY) Project,
Grant #AID-497-A-1600004, Sub-grant #IIE-00000078-UI-1.
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