Estimating Safety Effects of Green-Man Countdown Devices at Signalized Pedestrian Crosswalk Based on Cellular Automata
Safety effects of Green-Man Countdown Device (GMCD) at signalized pedestrian crosswalks are evaluated. Pedestrian behavior at GMCD and non-GMCD crosswalks is observed and analyzed. A microsimulation model is developed based on field observations to estimate safety performance. Simulation outputs all...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Journal of Advanced Transportation |
| Online Access: | http://dx.doi.org/10.1155/2017/8391325 |
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| _version_ | 1832548937622355968 |
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| author | Chen Chai Xiupeng Shi Yiik Diew Wong |
| author_facet | Chen Chai Xiupeng Shi Yiik Diew Wong |
| author_sort | Chen Chai |
| collection | DOAJ |
| description | Safety effects of Green-Man Countdown Device (GMCD) at signalized pedestrian crosswalks are evaluated. Pedestrian behavior at GMCD and non-GMCD crosswalks is observed and analyzed. A microsimulation model is developed based on field observations to estimate safety performance. Simulation outputs allow analysts to assess the impacts of GMCD at various conditions with different geometric layout, traffic and pedestrian volumes, and the green time. According to simulation results, it is found that the safety impact of GMCD is affected by traffic condition as well as different time duration within green-man signal phase. In general, GMCD increases average walking velocity, especially during the last few seconds. The installation of GMCD improves safety performance generally, especially at more crowded crossings. Conflict severity is increased during last 10 s after GMCD installation. Findings from this study suggest that the current practice, which is to install GMCD at more crowded crosswalks or near the school zone, is effective. Moreover, at crosswalks with GMCD, longer all red signal phase is suggested to improve pedestrian safety during intergreen period. |
| format | Article |
| id | doaj-art-26f1ecfe5fca4fc0b3e1d2e2af786070 |
| institution | Kabale University |
| issn | 0197-6729 2042-3195 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Advanced Transportation |
| spelling | doaj-art-26f1ecfe5fca4fc0b3e1d2e2af7860702025-02-03T06:12:36ZengWileyJournal of Advanced Transportation0197-67292042-31952017-01-01201710.1155/2017/83913258391325Estimating Safety Effects of Green-Man Countdown Devices at Signalized Pedestrian Crosswalk Based on Cellular AutomataChen Chai0Xiupeng Shi1Yiik Diew Wong2The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Shanghai 201804, ChinaCentre for Infrastructure Systems, Nanyang Technological University, 50 Nanyang Avenue, 639798, SingaporeCentre for Infrastructure Systems, Nanyang Technological University, 50 Nanyang Avenue, 639798, SingaporeSafety effects of Green-Man Countdown Device (GMCD) at signalized pedestrian crosswalks are evaluated. Pedestrian behavior at GMCD and non-GMCD crosswalks is observed and analyzed. A microsimulation model is developed based on field observations to estimate safety performance. Simulation outputs allow analysts to assess the impacts of GMCD at various conditions with different geometric layout, traffic and pedestrian volumes, and the green time. According to simulation results, it is found that the safety impact of GMCD is affected by traffic condition as well as different time duration within green-man signal phase. In general, GMCD increases average walking velocity, especially during the last few seconds. The installation of GMCD improves safety performance generally, especially at more crowded crossings. Conflict severity is increased during last 10 s after GMCD installation. Findings from this study suggest that the current practice, which is to install GMCD at more crowded crosswalks or near the school zone, is effective. Moreover, at crosswalks with GMCD, longer all red signal phase is suggested to improve pedestrian safety during intergreen period.http://dx.doi.org/10.1155/2017/8391325 |
| spellingShingle | Chen Chai Xiupeng Shi Yiik Diew Wong Estimating Safety Effects of Green-Man Countdown Devices at Signalized Pedestrian Crosswalk Based on Cellular Automata Journal of Advanced Transportation |
| title | Estimating Safety Effects of Green-Man Countdown Devices at Signalized Pedestrian Crosswalk Based on Cellular Automata |
| title_full | Estimating Safety Effects of Green-Man Countdown Devices at Signalized Pedestrian Crosswalk Based on Cellular Automata |
| title_fullStr | Estimating Safety Effects of Green-Man Countdown Devices at Signalized Pedestrian Crosswalk Based on Cellular Automata |
| title_full_unstemmed | Estimating Safety Effects of Green-Man Countdown Devices at Signalized Pedestrian Crosswalk Based on Cellular Automata |
| title_short | Estimating Safety Effects of Green-Man Countdown Devices at Signalized Pedestrian Crosswalk Based on Cellular Automata |
| title_sort | estimating safety effects of green man countdown devices at signalized pedestrian crosswalk based on cellular automata |
| url | http://dx.doi.org/10.1155/2017/8391325 |
| work_keys_str_mv | AT chenchai estimatingsafetyeffectsofgreenmancountdowndevicesatsignalizedpedestriancrosswalkbasedoncellularautomata AT xiupengshi estimatingsafetyeffectsofgreenmancountdowndevicesatsignalizedpedestriancrosswalkbasedoncellularautomata AT yiikdiewwong estimatingsafetyeffectsofgreenmancountdowndevicesatsignalizedpedestriancrosswalkbasedoncellularautomata |