Effects of the Open Road Tolling on Safety Performance of Freeway Mainline 2 Toll Plazas 3 4 5 Hong Yang (Corresponding Author) 6 Ph
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1 Effects of the Open Road Tolling on Safety Performance of Freeway Mainline 2 Toll Plazas 3 4 5 Hong Yang (Corresponding Author) 6 Ph. D. Candidate, 7 Rutgers Intelligent Transportation Systems (RITS) Laboratory, 8 Department of Civil and Environmental Engineering, 9 Rutgers, The State University of New Jersey, 10 623 Bowser Rd. Piscataway, NJ 08854 USA, 11 Tel: (732) 445-0576 x119 12 Fax: (732) 445-0577 13 E-mail: [email protected] 14 15 Kaan Ozbay, Ph. D. 16 Professor & Director, 17 Rutgers Intelligent Transportation Systems (RITS) Laboratory, 18 Department of Civil and Environmental Engineering, 19 Rutgers, The State University of New Jersey, 20 623 Bowser Rd. Piscataway, NJ 08854 USA, 21 Tel: (732) 445-2792 22 Fax: (732) 445-0577 23 E-mail: [email protected] 24 25 Bekir Bartin, Ph. D. 26 Research Associate, 27 Rutgers Intelligent Transportation Systems (RITS) Laboratory, 28 Department of Civil and Environmental Engineering, 29 Rutgers, The State University of New Jersey, 30 623 Bowser Rd. Piscataway, NJ 08854 USA, 31 Tel: (732) 445-3162 32 Fax: (732) 445-0577 33 E-mail: [email protected] 34 35 36 37 Abstract: 263 38 Word count: 4712 Text + 7 Tables + 4 Figures = 7462 39 Submission Date: August 1, 2011 40 Resubmission Date: November 15, 2011 41 42 43 44 Paper submitted for Presentation and Publication in the 45 Transportation Research Record, Journal of Transportation Research Board after being presented 46 Transportation Research Board’s 91st Annual Meeting, Washington, D.C., 2012 DownloadedTRB 2012 from Annual amonline.trb.org Meeting Paper revised from original submittal. Yang, Ozbay and Bartin 2 1 ABSTRACT 2 Advances of Intelligent Transportation Systems (ITS) technologies promoted the implementation 3 of open road tolling (ORT) on tolled freeways worldwide. This new tolling solution converts 4 existing barrier tollbooths to express lanes capable of collecting tolls at high-speeds. ORT has 5 demonstrated numerous benefits in reducing traffic congestion and air pollution. However, 6 effects of ORT on safety are still not clear, as most of ORT systems have only been operated for 7 a relatively short period of time. Therefore, this study aims to evaluate the safety impacts of ORT 8 by studying locations where such tolling solution was recently deployed on the Garden State 9 Parkway in New Jersey. Multiple-year crash data at the toll plazas before-after the 10 implementation of the ORT systems were used for analysis. Full Bayes methodology is 11 employed to estimate crash frequency models as a function of traffic and toll plaza 12 configurations. These models were used to estimate the crash frequency assuming that the ORT 13 systems were not installed. Then, these estimations were compared with the observed number of 14 crashes occurred after the deployment of the ORT systems. Individual comparisons show that 15 crash reductions are observed at most of the toll plazas. The overall comparison shows that 16 crashes at locations where ORT systems were deployed are decreased by about 24 percent after 17 deployment of these systems. It can thus be concluded that the use of ORT is a beneficial 18 solution towards improving toll road safety. From an implementation point of view, the analyses 19 results indicate that special attention should be paid to operational elements such as signage, 20 diversion and merge designs of the ORT systems. DownloadedTRB 2012 from Annual amonline.trb.org Meeting Paper revised from original submittal. Yang, Ozbay and Bartin 3 1 INTRODUCTION 2 Open road tolling (ORT) is a new generation of tolling solution that will eventually lead to a 3 conversion of conventional toll plazas to barrier-free electronic toll collections in the future. By 4 design, ORT consisting of high-speed (express) electronic toll collection (ETC) lanes allows 5 vehicles to electronically and automatically pay tolls without slowing down from highway 6 speeds. Typically, there are two types of implementation of ORT (1). The first type is the all- 7 electronic ORT which completely replaces barrier tollbooths by express ETC lanes (2, 3). 8 Without the presence of tollbooths, this type of ORT design enables automatic debiting via in- 9 vehicle transponders (e.g., E-ZPass tags) or other automatic vehicle identification (AVI) 10 technologies. The second is the interim type of ORT implementation, which is being deployed by 11 many toll authorities. It installs express ETC lanes by retrofitting existing tollbooths to permit 12 high-speed non-stop toll collection for ETC users and other registered users only (1, 4). Cash or 13 coin users are still diverted to use remaining barrier booths off the express ETC lanes. 14 In the United States, many highway authorities in states like New Jersey, Florida and 15 Illinois have implemented the ORT concept in recent years (e.g., 5-7). Demonstration projects 16 have shown that the implementation of ORT is an effective means of relieving congestion. For 17 example, Klodzinski et al. (1) evaluated the addition of ORT to a mainline toll plaza in Florida 18 and found that installation of express ETC lanes reduced delays by 49.8 percent for cash users 19 and by 55.3 percent for automatic coin machine (ACM) users. According to Levinson and 20 Odlyzko (8), express ETC lanes of ORT can increase throughput, from 350 to 400 vehicles per 21 hour per lane with manual collection up to 2200 vehicles per hour per lane. The use of ORT has 22 also been shown to significantly reduce emissions. For instance, Lin and Yu (9) quantified 23 various ORT deployment scenarios on Illinois toll highways and suggested that the near roadside 24 carbon monoxide concentration levels and diesel particulate matter emissions can be reduced by 25 up to 37 percent and 58 percent, respectively. 26 While ORT can sharply reduce transaction-related delays and pollution at toll plazas, 27 safety impacts of retrofitting existing toll plazas and installing express ETC lanes, however, is 28 still not so clear. ORT systems can be deemed safer since high-speed tolls avoid the safety 29 deficiency of barrier toll plazas as they eliminate many stop-and-go traffic, dangerous 30 interactions and distractions (10). On the other hand, diverging and merging of vehicles that use 31 express ETC lanes at higher speeds might increase traffic conflicts (e.g., 11, 12). Cash and coin 32 users must exit to use the barrier tollbooths and then merge with high-speed users on express 33 lanes. These maneuvers may raise more safety issues. Unlike those easily measurable benefits 34 such as capacity improvement and reduction of costs in toll collection (e.g., 13-16), it is difficult 35 to evaluate safety performance of the new tolling solution shortly after its implementation 36 because of the random and rare occurrence of motor vehicle crashes. Quantifying safety 37 performance of ORT requires long-term crash data collected at toll plazas with and without the 38 deployment of ORT. 39 This study aims to evaluate the impact of implementing ORT on crash rates at toll plazas 40 by using extensive data collected at multiple mainline toll plazas with and without the 41 deployment of express ETC lanes on Garden State Parkway in New Jersey. The crash data 42 available in this study cover the period from January 2001 to December 2009. Therefore, safety 43 performance of toll plazas with and without express ETC lanes can be analyzed and compared 44 using these multiple-year crash data (17). DownloadedTRB 2012 from Annual amonline.trb.org Meeting Paper revised from original submittal. Yang, Ozbay and Bartin 4 1 OPEN ROAD TOLLING IN NEW JERSEY 2 Gardens State Parkway (GSP) is a 172.4-mile limited-access toll parkway with 359 exits and 3 entrances. Over 380 million vehicles travel the GSP which stretches the length of New Jersey 4 (NJ) from the New York (NY) state line at Montvale to Cape May at the southern tip of the state. 5 Tolls are collected at 50 locations, including 11 mainline toll plazas and 39 on entrance and exit 6 ramps (18). It is among America’s busiest highways, serving users from NJ and NY’s most 7 marketable communities (19, 20). 8 The GSP operator (GSP was operated by the NJ Highway Authority (NJHA) until 2003 9 and later by the NJ Turnpike Authority (NJTA)) always focused on using new toll collection 10 technologies to improve tolling efficiency and reduce congestion. After the first toll collected 11 manually in 1954, automatic coin machines (ACM) were introduced in early 1950s and had 12 spread to most toll plazas and ramps on the Parkway by 1959 (21). When a toll increased beyond 13 the quarter, tokens were introduced in the early 1980s. They continued to be available until 14 January 2002 and ceased to be accepted in payment in January 2009 (21). Regular (low-speed) 15 ETC system was implemented in 1999. The entire ETC system was completed in August 2000 16 (20). The ETC system has been widely adopted by travelers with an ETC penetration rate beyond 17 70 percent on GSP (22). 18 In 2001, the state government issued an order to promote a 10-year congestion relief plan 19 for GSP (13). Under the plan, elimination of mainline barriers in one direction and use of express 20 ETC lanes of ORT in the other were recommended. By 2010, all mainline barriers except Toms 21 River were converted to one-way tolling (express ETC lanes were added to both directions at the 22 Toms River toll plaza). Between 2004 and 2006, the open road tolling program was implemented. 23 Express ETC lanes of ORT have been installed at a number of toll plazas listed in TABLE 1.