Test of IR-DSRC in Measuring Vehicle Speed for ITS Applications [chapter]

Hyung Jin Kim, Jin-Tae Kim, Kee Yeon Hwang
2006 Lecture Notes in Computer Science  
Wireless communication technology has been introduced in the field of Intelligent Transportation Systems (ITS) in the past decades, and its applicability has been widely expending. Feasibility of the IR-DSRC based vehicle detection systems in measuring vehicle speed was tested as a possible alternative of the conventional inductive loop based systems requiring high construction and maintenance cost. It was found from the field test that the speed data from the IR-DSRC detection systems were
more » ... istically identical to the ones from the loop based systems at 95% confidence level. time required to pay toll fees. Dedicated Short Range Communication (DSRC) is core technology that allows vehicle-to-roadside communication with the On-board Equipment (OBE) installed inside of vehicles and the Road-side Equipment (RSE) installed nearby the road. ETCS collects toll fees from moving vehicles by utilizing DSRC technology. This allows road users to pass the toll gate area without stopping. The ETCS service has widely been recognized and used by many road users. Due to driving convenience, the number of vehicles equipped ETCS OBE is being increased. Those vehicles with ETCS OBE are running not only on freeways but also on urban highways. If the vehicles are treated as probe vehicles and a number of RSEs are equipped on roadsides, there would be a chance to collect valuable traffic information from urban highway networks. Conventional loop based systems, requiring high construction and maintenance cost, can be replaced with the DSRC based detection systems, as long as the accuracy of the data meet the system requirements. This paper presents a study conducted to test feasibility of IR-DSRC as an alternative to collect speed information from an approach at a signalized intersection in urban traffic networks. A pair of sample speed data was prepared from field tests with the conventional loop and the IR-DSRC detection systems. They were compared to answer if the ones from IR-DSRC were statistically different from the others from the conventional loop-based detection systems. Wireless Communication in ITS Automated Traffic Surveillance and Control (ATSAC) is the traffic signal control systems in Los Angelis metropolitan area in the United States [5, 6]. Victor et al. [6] tested 900 MHz wireless communication as an alternative to the conventional fiberbased communication utilized in ATSAC. They proposed that a server collect the raw data at the local controller level once a 0.5 seconds and found that each local controllers belonged to ATSAC was always connectable to the server at least 1.0 times a second despite heavy communication load. They employed a dynamic communication path searching algorithms to make it possible. Communication frequency level, 900 MHz, however, is open to the public. Although it makes it easy to utilize wireless communication in the bandwidth, this makes the systems be vulnerable due to interruptions from conventional communication systems, such as laser scanners at convenience stores. In recent decades, DSRC technology has been extensively introduced in the field of ITS. DSRC allows vehicles to communicate with RSE with either 5.8 G-Hz radio frequencies (RF) or infra-red (IR). Communication range of IR-DSRC can be adjusted from a couple of meters to several hundred meters based on its usage. Klein [7] employed IR-based wireless communication systems to deliver a video streaming data from field to traffic management center in Anaheim, CA. He reported that IR communication method can deliver a video streaming data at acceptable level and that this IR-based technology increases efficiency of the systems. Korea Transport Institute (KOTI) [1, 2] has developed a Wireless Interface Signals for Dynamic and Optimal Management (WISDOM) which performs as a single platform providing with traffic control scheme and information systems. Both IR-based and RF-based wireless communication systems were tested in their study.
doi:10.1007/11807964_103 fatcat:55gqam453nhqtam5l3a55sge3y