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The purpose of this study is to analyze the effect of heavy vehicles on traffic flow on a two-lane highway. To achieve this goal, data was obtained from piezosensors on the Seoul–Chuncheon Expressway. Analysis of the data showed that, as everyone knows, the average speed of traffic flows decreases as the proportion of heavy vehicles increases. However, not only the speed decreased, but the speed deviation between vehicles decreased. In other words, it was found that within the traffic group that formed the same platoon, individual vehicles were forced to form similar speeds, resulting in a homogeneous rate. This means that heavy vehicles can be included in the traffic stream, reducing the chances of a vehicle-to-vehicle conflict. This kind of influence can be said to explain that heavy vehicles do not necessarily have a negative effect on traffic flow. In this way, we expect to be able to study ways to manage traffic flow by using the effects of low-speed vehicles.
Chang-Gyun Roh; Hyeonmyeong Jeon; Bongsoo Son. Do Heavy Vehicles Always Have a Negative Effect on Traffic Flow? Applied Sciences 2021, 11, 5520 .
AMA StyleChang-Gyun Roh, Hyeonmyeong Jeon, Bongsoo Son. Do Heavy Vehicles Always Have a Negative Effect on Traffic Flow? Applied Sciences. 2021; 11 (12):5520.
Chicago/Turabian StyleChang-Gyun Roh; Hyeonmyeong Jeon; Bongsoo Son. 2021. "Do Heavy Vehicles Always Have a Negative Effect on Traffic Flow?" Applied Sciences 11, no. 12: 5520.
Incheon is a major city comprising the metropolitan area around Seoul. However, it ranks the lowest in terms of road extension scale relative to population and number of vehicles. There is extreme traffic congestion and shortages of parking spaces in downtown Incheon, impacting traffic. Alternative policies of the municipal government to address these issues, including road extension and improving public transportation, have not shown results because of the low satisfaction level of the public transportation service and limited transportation mode transfer owing to travel within the metropolitan area. Therefore, to improve the public transportation service, conducting a comprehensive analysis on the current service and improving its quality were deemed necessary. Additionally, adopting a demand response public transportation service was considered. In conjunction, objective and easy-to-use data should be used, so that if anyone repeats the procedure, the same result should be obtained. For this, we propose the simplest process. Thus, to introduce the service, this study presents a decision-making process by establishing a regional prioritizing methodology based on the transportation environment satisfaction level, average access time to major facilities, public transportation competitiveness, personal vehicle demand, and existing public transit routes. To assess the methodology feasibility and conformity, user satisfaction was analyzed in Jung-gu, Incheon. The analysis showed 91% user satisfaction, verifying that the demand response public transportation service was effectively supplied. This analysis process will be useful when applying and expanding new transportation services.
Chang-Gyun Roh; Hyeonmyeong Jeon. Decision-Making Process for Demand Response Public Transportation Service Design—A Case Study in Incheon, Korea. Sustainability 2021, 13, 5574 .
AMA StyleChang-Gyun Roh, Hyeonmyeong Jeon. Decision-Making Process for Demand Response Public Transportation Service Design—A Case Study in Incheon, Korea. Sustainability. 2021; 13 (10):5574.
Chicago/Turabian StyleChang-Gyun Roh; Hyeonmyeong Jeon. 2021. "Decision-Making Process for Demand Response Public Transportation Service Design—A Case Study in Incheon, Korea." Sustainability 13, no. 10: 5574.
In the event of a nuclear accident, evacuation is the most effective protective action for the public. During the evacuation, total travel time is a key measure to protect the public because it is directly related to the public’s radiation exposure. Thus, strategies that reduce the total travel time are needed for a safer nuclear emergency plan. Many studies on evacuation strategies so far have suggested the methodology of effective routing decisions or delay management. Despite the application of those strategies during evacuation, the effectiveness of those strategies, in reality, varies depending on the level of travel demand. In this study, evacuation strategies based on travel demand levels were evaluated based on the case of the Emergency Planning Zone (EPZ) of HANARO, the nuclear research reactor in the Republic of Korea. As a result, it was confirmed that effective evacuation strategies could be applied differently according to travel demand levels.
Bongseok Kim; Hyeonmyeong Jeon; Bongsoo Son. Evaluation of Evacuation Strategies According to the Travel Demand: The Case of Nuclear Research Reactor HANARO’s EPZ. Sustainability 2020, 12, 6128 .
AMA StyleBongseok Kim, Hyeonmyeong Jeon, Bongsoo Son. Evaluation of Evacuation Strategies According to the Travel Demand: The Case of Nuclear Research Reactor HANARO’s EPZ. Sustainability. 2020; 12 (15):6128.
Chicago/Turabian StyleBongseok Kim; Hyeonmyeong Jeon; Bongsoo Son. 2020. "Evaluation of Evacuation Strategies According to the Travel Demand: The Case of Nuclear Research Reactor HANARO’s EPZ." Sustainability 12, no. 15: 6128.