Analysis of Characteristics and Reliability of Smart Card Data in Metropolitan Seoul1) Jin-Young Park*⋅Dong-Jun Kim**
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서울도시연구 제8권 제4호 2007. 12, 논문 -Original Paper- pp. 127~138. 127 Analysis of Characteristics and Reliability of Smart Card Data in Metropolitan Seoul1) Jin-Young Park*⋅Dong-Jun Kim** 서울시 교통카드자료의 특성 및 신뢰성 분석 박 진 영*⋅김 동 준** ABSTRACT:The use of smart cards for fare payment in public transit has grown in Korea since their introduction in 1996. Currently, the proportion of smart card use in Seoul is more than 90% for buses and 75% for metros. In 2004, the Seoul metropolitan government introduced a new smart card system with a distance based fare system, which requires detailed data of users such as boarding time and GPS-based vehicle location. To investigate the reliability of smart card data, the number of users of every Metro station in Seoul gathered from smart card data were compared with data directly from the Seoul Metro Company(SMC). With two simple manipulations to include daily variations and the number of cash users, the smart card data appears statistically indifferent with surveyed data from the Seoul Metro Company. Analyzing line specific proportions of smart card use instead of average smart card use improves the accuracy of the results. From the results, therefore, smart card data show potential as a basis for describing characteristics of public transit users, such as number of transfers, boarding time, hourly trip distribution of number of trips for different transit modes, and travel time distribution for all transit modes and user types. Key Words:smart card, public transit, statistical analysis 요약:1996년 서울시를 필두로 도입된 교통카드는 국내 많은 지역에서 대중교통 이용 편의와 요금징수 용이성 제고를 위해 사용되고 있으며, 이용률도 전국적으로 증가하고 있는 추세이다. 현재 교통카드는 주로 요금징수를 위한 목적으로 사용되고 있으나 교통카드에는 탑승위치와 탑승시간 등 활용가능성이 높은 다양한 정보들이 기록되고 수집되고 있어 이러한 정보의 활용에 대해 많은 교통관련 연구자들이 관심을 가지고 있다. 본 연구에서는 서울시 교통카드 이용자료를 활용하여 대중교통과 관련된 지표들을 산출해 보고, 교통카드 이용자료의 전수화와 지하철 공사 발표 자료와의 비교를 통해 교통카드 이용자료 의 신뢰성을 분석해 보았다. 분석결과 지하철공사자료와 교통카드 이용자료는 차이가 없는 것으로 나타 났으며, 특히 지하철 호선별 교통카드 이용비율을 적용한 결과 교통카드 이용자료의 신뢰성이 높아지는 것으로 나타났다. 본 연구를 통해 교통카드 이용자료의 잠재적 활용가능성을 파악할 수 있었으며, 교통카 드 이용자료 활용시 지하철 및 버스 노선별 자료의 적용 필요성 및 향후 연구주제 등을 제시하였다. 주제어:교통카드, 대중교통, 통계분석 * Research Associate, Department of Metropolitan & Urban Transportation Research, The Korea Transport Institute(한국교통연구원 광역도시 교통연구실 책임연구원) ** Researcher, Department of Metropolitan & Urban Transportation Research, The Korea Transport Institute(한국교통연구원 광역도시교통연 구실 연구원) 128 서울도시연구 제8권 제4호 2007. 12 Ⅰ. Introduction implemented smart card for public transit fare payment currently used. In Europe and Asia, the A smart card, or integrated circuit card (ICC), is smart card is a more popular option for fare defined as any pocket-sized card with embedded payment. Including London("Oyster" card) and Paris integrated circuits which can process information. ("Navigo"), smart cards are currently used in 22 This implies that the card can receive input which cities in Europe. Asia has been a pioneer for using is processed - by way of the ICC applications - smart card for fare payment in public transit from and delivered as an output. After first being used the mid-1990’s. Currently more than 30 cities are for bank application, smart cards with contactless using smart cards for public transit fare payment. interfaces are becoming increasingly popular for While the use of smart card data is spreading payment and ticketing applications such as for through out the world, studies related to smart card riding mass transit. Across the world, contactless data are just in the early stages of work. TCRP fare collection systems are being implemented to Report 10 by TRB(1996) discussed smart cards as improve efficiencies in public transit. The various a new method for fare payment in public transit. standards emerging are local and are not Most of papers have focused on technology and compatible, though the MIFARE card from Philips field implementation(Giuliano et al., 2000; Barth et has a considerable market share in the US, Europe al., 2003; Cheung, 2004; Espinosa et al., 2005; and Asia. The contactless smart card, in which the Iseki et al., 2007). Recent work by Bagchi and chip communicates with the card reader through White(2005) performed three case studies in Radio Frequency IDentification (RFID) induction British networks and discussed the potential of technology(at data rates of 106 to 848 kbit/s), smart card data for transit planning. They stated requires only close proximity to an antenna to that smart cards should not replace conventional complete transaction. They are often used when data collection methods. Also Utsunomiya et al. transactions must be processed quickly or (2006) discussed potential use of smart card to hands-free, such as on mass transit systems, where improve transit planning. Trepanier and Chapleau smart cards can be used without even removing (2006) suggested if a smart card system could them from a wallet. locate boarding and alighting locations, it would Because of the convenience of quick and provide transit planners with interesting contactless processing, these smart cards have been information on route profiles. Also Morency et wide spread a method all over the world for use in al.(2007) measured spatial and temporal variability public transit fare payment. In the USA, the of transit users from smart card data through an "Breeze" card in Atlanta, "Translink" card in the San object-oriented approach. But a lack of boarding Francisco Bay area, "Charlie" card in Boston, and information on smart card data restricted the scope "Smart Trip" card in Washington D.C. are currently of the study. Analysis of Characteristics and Reliability of Smart Card Data in Metropolitan Seoul 129 TABLE 1. Smart Cards for Fare Payment in 2007 Cards Issued Terminals Date Introduced No. of sites No. of sites Area No. (month/year) % No. % selling cards recharging cards (10thousand) Total 5,780 100 54,646 100 13,214 15,736 Bus 01/96 Seoul 3,370 56.8 32,273 57.7 5,908 6,453 Metro 06/98 Busan Bus, Metro 02/98 892 15.0 7,347 13.1 2,558 2,664 Bus 11/00 Daegu 376 6.3 2,432 4.3 675 823 Metro 07/02 Bus 09/98 Incheon - - 595 1.1 611 678 Metro 12/99 Bus 02/98 Gwangju 93 1.6 1,181 2.1 263 289 Metro 10/04 Daejeon Bus 09/03 72 1.2 1,084 1.9 182 632 Ulsan Bus 09/02 86 1.4 655 1.2 165 165 Gyeonggi Bus 05/96 567 9.6 1,985 3.5 1,329 1,679 Wonju Bus 06/01 Gangwon 4 0.1 565 1.0 58 808 ChunCheon Bus 08/02 Chungbuk Bus 07/03 50 0.8 704 1.3 147 147 Chungnam Bus 07/04 34 0.6 1,084 1.9 168 168 Jeonbuk Bus 01/02 66 1.1 970 1.7 405 405 Jeonnam Bus 11/02 33 0.6 870 1.6 159 159 Gyeongbuk Bus 02/02 14 0.2 859 1.5 202 267 Gyeongnam Bus 07/02 101 1.7 1,608 2.9 304 319 Jeju-city Bus 02/98 Jeju 22 0.4 434 0.8 80 80 Seogwipo-city Bus 05/03 TABLE 2. Proportion of Smart Card Use in 2005 Area Seoul Busan Daegu Incheon Gwangju Daejeon Boardings Using Smart Card (%) 81 70 46 80 64 44 Area Ulsan Gangwon Chungnam Jeonnam Gyeongnam - Boardings Using Smart Card (%)) 68 20 41 18 17 - Ⅱ. Smart Card Data in Metropolitan Seoul Metro users were using smart cards for fare payment. About twenty million transactions Smart cards have been in use for fare payment occurred every day. Table 2 shows the proportion since 1996 in Korea. Table 1 shows the history of smart card use in Korea. However, with such an and current use of smart cards in Korea, including early implementation of smart cards, Seoul’s smart Seoul. Currently more than 80% of public transit card system had suffered due to a lack of capacity users are using smart cards for fare payment in the and security. Thus, the Seoul metropolitan Seoul area. In 2005, 90% of bus users and 72% of government implemented a new smart card system 130 서울도시연구 제8권 제4호 2007. 12 named "T-money." Metro stop. Also, boarding and alighting time is The Seoul metropolitan government introduced a recorded to give free transfer among different new distance-based fare system in public transit modes. Table 3 shows the types of data recorded with the new smart card system. The new fare on the smart card system in Seoul. Because over system varies by mode of transportation and total 80% of public transit users are using the smart distance traveled. The fare for public transit starts card and with such detailed information about at 800 Korean Won (about US$0.80) for the first public transit users, the smart card data have ten km and increases by 100 Korean Won (about potential as a new information source for public US$0.10) for increments of five kilometers. The transit-related studies. base fare also includes up to four free transfers applicable to both bus and Metro for 30 minutes Ⅲ. Characteristics of Smart Card Data after last alighting. Hence, in Seoul, users should of Metropolitan Seoul contact fare collection terminals twice with smart cards: when one enters the station or vehicle and To investigate the potential of smart card data, when one exits. some important public transportation figures are To accommodate the distance-based fare system, derived from Seoul’s smart card data.