Engineering Commons^™

Zero-Emission Transit Bus And Refueling Technologies And Deployment Status: A Review Across U.S. Transit Agencies, Aikaterini Deliali

Transportation Engineering Masters Projects

Globally there have been considerable efforts of decarbonizing the transportation sector, as it has been found to be largely responsible for greenhouse gases and other air pollutants. One strategy to achieving this is the implementation of zero-emission buses in transit fleets. This paper summarizes the characteristics of three zero-emission bus technologies: 1) battery electric buses; 2) fuel cell battery electric buses; and 3) fuel cell plug-in hybrid electric buses. All of these technologies do not produce tailpipe emission and can potentially be emission-free in a well-to-wheel content, depending on the fuel source. This study aims in gathering the needed information …

Passenger Detection Though Video Processing And Signal Sensors In The Boston Subway To Address Left-Behind Passengers, Andronikos Keklikoglou

Transportation Engineering Masters Projects

Crowding is one the most common problems for public transportation systems worldwide. It has been proven to cause anxiety to commuters and create reliability problems when commuters are not able to board on the first train or bus that arrives. These commuters are referred as left-behind passengers, and their number is directly related to various basic performance measures of public transportation systems that represent the user’s experience. Among these measures the most significant are ridership, service quality and, more importantly, travel time. Identifying left behind passengers is a tool to address crowding in stations and respond appropriately, by applying various …

A Safety And Emissions Analysis Of Continuous Flow Intersections, Joshua Wolfgram

Transportation Engineering Masters Projects

Increasing travel demand, and challenges associated with high percentages of left-turning vehicles, have encouraged the introduction of significant infrastructure advancements. Certain alternative intersection designs, such as continuous flow intersections, median U-turns, and jughandles, eliminate the traditional protected left-turn, increasing the intersection's optional efficiency. While the design and operations of these intersection types have been studied to varying degrees, their safety and emissions-related impacts are not well-understood.

This project develops a series of microsimulation models for two continuous flow intersections (CFI) located in Missouri and Colorado, and uses the Surrogate Safety Assessment Model (SSAM) to determine the impact of those designs …