Dissertation/Thesis Abstract

A Comparison of Carbon Dioxide Emissions at a Roundabout and a Signalized Intersection in a Mid-Sized City
by Lamb, Breana K., M.S., Southern Illinois University at Edwardsville, 2015, 135; 1591070
Abstract (Summary)

Greenhouse gases (GHG) are increasing in our atmosphere. They have been known to cause changes to our hydrological cycle and manipulate other natural phenomena. Transportation is one of the main causes of this increase. Therefore it is essential to discover ways to reduce GHG caused by the transportation sector. This study aims to determine if roundabouts have lower levels of CO2 emissions when compared to signalized intersections in the mid-sized city of Belleville, Illinois.

Traffic data were collected on one weekday and one weekend day over two five-minute recording periods in the morning and two in the afternoon. Traffic data were used to calculate average CO2 emissions at the signalized intersection and the roundabout. Vehicles at the signalized intersection emitted lesser amounts during off peak hours but emitted more CO2 emissions during peak hours due to increased idle durations whereas vehicles at the roundabout emitted lesser amounts of CO2 emissions during peak traffic hours and more CO2 emissions during off peak hours due to the longer driving distances. This pattern occurred on both recording days. Thus, at different recording periods, one intersection experienced lower levels of CO2 emissions when compared to the other. While these findings are preliminary, they do suggest that roundabouts may be a more environmentally favorable option over traditional signalized intersections even in mid-sized cities.

Indexing (document details)
Advisor: Hildebrandt, Mark
Commitee: Grossman, Michael, Zhou, Bin
School: Southern Illinois University at Edwardsville
Department: Geography
School Location: United States -- Illinois
Source: MAI 54/05M(E), Masters Abstracts International
Subjects: Geography, Civil engineering, Atmospheric sciences
Keywords: Carbon dioxide, Roundabout, Signalized intersection
Publication Number: 1591070
ISBN: 9781321815252
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