This study develops a methodology to consohdate transit stops. It develops a mathematical model and a program which takes stop consolidation decision（s） according to users gener- alized travel time savings and desir...This study develops a methodology to consohdate transit stops. It develops a mathematical model and a program which takes stop consolidation decision（s） according to users gener- alized travel time savings and desired accessibility. The model iterates until the users generalized travel time savings are maximized. The study tests this mathematical model in different hypothetical scenarios. Six factors （distance between stops, passenger activity, average cruising speed, maximum walking distance, service frequency, and percentage of decreased passengers） with multiple levels were set to build the scenarios. Three responses {percentage of consolidated stops, percentages of travel time and operating time savings） were observed. The findings showed that the distance between the stops the passenger ac- tivity, and the probable demand change （or the percentage of decreased passengers） are the most influential factors. The frequency of service was found to be influential as well. The average cruising speed has very little influence on the response variables. Finally, the model is tested on two routes （route 900 and 930） ofAl Ain City public bus service. It shows that 22 and 32 out of 98 and 126 stops can be consolidated in route 900 and 930 respectively. This can save considerable amounts of users travel and operating times. In monetary values, the savings are about $329,827 and $491,094 per year for routes 900 and 930, respectively.展开更多
Climate change is the first real challenge of this global generation,and,so far,it hasn’t gone that well.Whether it’s rising sea levels threatening cities like Shanghai or expanding vectors of malaria,China must cha...Climate change is the first real challenge of this global generation,and,so far,it hasn’t gone that well.Whether it’s rising sea levels threatening cities like Shanghai or expanding vectors of malaria,China must change with the climate.As the glaciers of China’s Third Pole retreat,as new and more regular floods attack first-tier cities and rural towns alike,as wheat yields decrease in the north and entire lakes dry up in the west,the days of ignoring climate change have展开更多
基金part of an MSc study thesis sponsored by the Roadway,Transportation and Traffic Safety Research Center at the UAE University
文摘This study develops a methodology to consohdate transit stops. It develops a mathematical model and a program which takes stop consolidation decision（s） according to users gener- alized travel time savings and desired accessibility. The model iterates until the users generalized travel time savings are maximized. The study tests this mathematical model in different hypothetical scenarios. Six factors （distance between stops, passenger activity, average cruising speed, maximum walking distance, service frequency, and percentage of decreased passengers） with multiple levels were set to build the scenarios. Three responses {percentage of consolidated stops, percentages of travel time and operating time savings） were observed. The findings showed that the distance between the stops the passenger ac- tivity, and the probable demand change （or the percentage of decreased passengers） are the most influential factors. The frequency of service was found to be influential as well. The average cruising speed has very little influence on the response variables. Finally, the model is tested on two routes （route 900 and 930） ofAl Ain City public bus service. It shows that 22 and 32 out of 98 and 126 stops can be consolidated in route 900 and 930 respectively. This can save considerable amounts of users travel and operating times. In monetary values, the savings are about $329,827 and $491,094 per year for routes 900 and 930, respectively.
文摘Climate change is the first real challenge of this global generation,and,so far,it hasn’t gone that well.Whether it’s rising sea levels threatening cities like Shanghai or expanding vectors of malaria,China must change with the climate.As the glaciers of China’s Third Pole retreat,as new and more regular floods attack first-tier cities and rural towns alike,as wheat yields decrease in the north and entire lakes dry up in the west,the days of ignoring climate change have
