Sustainability

Collaboration and Equity in Regional Sustainability Planning in California: Challenges in Implementation

Frick, Karen Trapenberg
Chapple, Karen
Mattiuzzi, Elizabeth
Zuk, Miriam
2015

Regions across the United States have developed sustainability plans and programs funded through the U.S. Department of Housing and Urban Development’s Sustainable Communities Initiative (SCI). In California, this grant overlapped with a state mandate for regional sustainability planning, SB 375, legislation charging regions with developing long-range sustainability plans to reduce greenhouse gas emissions. Regional agencies lead sustainability planning efforts, yet little is known about how effective and equitable regions are in their engagement with sustainability planning. We examined...

Prediction of Vehicle Activity for Emissions Estimation Under Oversaturated Conditions Along Signalized Arterials

Skabardonis, Alexander
Geroliminis, Nikolas
Christofa, Eleni
2013

The traditional methodology for estimating vehicle emissions based on vehicle miles traveled and average speed is not reliable because it does not consider the effects of congestion, control devices, and driving mode (cruise, acceleration, deceleration, and idle). The authors developed an analytical model to predict vehicle activity on signalized arterials with emphasis on oversaturated traffic conditions. The model depends only on loop detector data and signal settings as inputs and provides estimates of the time spent in each driving mode, which consequently leads to more accurate...

Connected & Autonomous Vehicles – Environmental Impacts – A review

Kopelias, Pantelis
Elissavet, Demiridi
Vogiatzis, Konstantinos
Skabardonis, Alexandros
Zafiropoulou, Vassiliki
2020

Over the last decades the vehicle industry has shown interest in integrating new technologies on vehicles’ design. Such technologies are used in autonomous, connected and electrical vehicles with the primary hope of improving road safety and the environmental impact of road traffic. Regarding the environmental impact, the transport sector has been considered responsible for Greenhouse Gas emissions for the past thirty years or more, and efforts have been made to reduce impacts of such emissions on the environment. The environmental noise is also associated with road traffic and its effects...

Uncovering Physical Activity Trade-Offs in Transportation Policy: A Spatial Agent-Based Model of Bogotá, Colombia

Stankov, I
Meisel, JD
Sarmiento, OL
Delclòs-Alió, X
Hidalgo, D
Guzman, L
Rodriguez, D
Hammond, R
Roux, AV Diez
2024

Transportation policies can impact health outcomes while simultaneously promoting social equity and environmental sustainability. We developed an agent-based model (ABM) to simulate the impacts of fare subsidies and congestion taxes on commuter decision-making and travel patterns. We report effects on mode share, travel time and transport-related physical activity (PA), including the variability of effects by socioeconomic strata (SES), and the trade-offs that may need to be considered in the implementation of these policies in a context with high levels of necessity-based physical...

Feasibility Study for the Use of Biodiesel in the Caltrans Fleet

Miller, J. Wayne
Durbin, Thomas D.
2009

Over the past several years, biodiesel use has dramatically increased due to its potential emissions benefits, classification as a low-carbon/renewable fuel and ability to be integrated into diesel fleet applications without significant infrastructure or other substitution issues. Caltrans has largest fleet in California, so biodiesel would provide many benefits in terms of meeting environmental and energy security objectives. However, all aspects of biodiesel use needed to be thoroughly investigated, including potential benefits and liabilities, prior to widespread introduction into the...

Travel, Emissions, and Consumer Benefits of Advanced Transit Technologies in the Sacramento Region

Johnston, R.
Rodier, C.
1996

The purpose of this project was to examine the potential travel effects, emissions, and consumer welfare benefits of advanced transit technologies. These technologies included advanced transit information, demand responsive transit, and personal rapid transit. The Sacramento Regional Travel Demand model (SACMET 95) was used to simulate the travel effects. Consumer welfare evaluation was accomplished by applying the Small-Rosen model to SACMET. Five advanced transit scenarios for the Sacramento region in the year 2015 were examined. It was found that the advanced transit technologies, which...

Transportation Modeling for the Environment

Barth, Matthew J.
Norbeck, Joseph M.
1994

In this report, the authors describe preliminary research dealing with vehicle emissions associated directly with 1) Automated Highway Systems ( AHS) and 2) ramp metering. In performing this analysis, a power-demand modal emissions model has been integrated with several transportation simulation models in order to quantitatively determine the effects of Intelligent Transportation Systems (ITS) technology on vehicle emissions. For AHS, a steady-state speed/emissions comparison has been conducted between vehicles that are platooned and non-platooned. A comparison has been made between a...

Modeling IVHS Emission Impacts. Volume 1: Background Issues and Modeling Capabilities

Guensler, Randall
Washington, Simon
Sperling, Daniel
1994

This paper examines the potential air quality impacts of Intelligent Vehicle Highway Systems (IVHS) upon important emission-producing vehicle activities and those parameters that affect emission rates. Important emission relationships are identified, a framework for comparative analysis is developed, and the general relationships between IVHS technology bundle characteristics and vehicle emission impacts are examined. The primary IVHS emission-related impacts that this project addresses are associated with changes in the average speed and operating mode (acceleration, deceleration, cruise...

Longitudinal Model Development for Automated Roadway Vehicles

Mcmahon, Donn H.
Hedrick, J. K.
1990

In today’s society minimizing the use of the roadways is becoming an issue of increasing concern.Many major cities in the US are plagued with such problems as traftic congestion, poor air quality, andsafety problems. To solve these problems research throughout the world is being conducted on the use ofautomated roadways.Currently in the state of California research is being conducted involving several major institutionsas to the feasibility of the automated roadway. The Program on Advanced Technology for the Highway,PATH, aims to increase the capacity of the most used highways, to decrease...

Highway Electrification and Automation Technologies - Regional Impacts Analysis Project: Phase I: Baseline Scenario Data Analysis

Scag
Path
1993

The Highway Electrification and Automation Technologies Regional Impacts Analysis Project addresses the transportation-related problems of freeway congestion, air pollution, and dependence on fossil fuels in southern California. This report presents a documentation of the basis for the impacts analysis. It contains sections on data collected, baseline forecast for 2025, and electrification and automation specification scenarios. This report constitutes the final report for Phase I of the project.