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19 results on '"Parthasarathi, Pavithra"'

2. Evaluation Methods for Measuring the Value of ITS Services and Benefits from Implementation: Part X Freeway Service Patrols

Author

Levinson, David and Parthasarathi, Pavithra Kandadai

Subjects
Emergency road service--United States, Disabled vehicles on express highways--United States, Intelligent Vehicle Highway Systems--United States--Cost effectiveness, Highway communications--United States--Evaluation
Abstract

The goal of our report is to determine the value that people place on the benefits offered by freeway service patrols in comparison to private assistance services and how much they would be willing to pay to avoid being stranded when their vehicle breaks down on the freeway. The report investigates the factors that contribute to people choosing to rely on the highway assistance services in comparison to the private assistance services. The studies conducted so far have focused on the effectiveness of the freeway service patrol whereas this report analyzes the factors that influence people in choosing to rely on the freeway service patrol.

Published
2001

10. Accessibility Futures

Author

Anderson, Paul, Levinson, David, and Parthasarathi, Pavithra

Subjects
jel:R53, jel:R41, jel:R52, jel:R14, jel:R12, Accessibility, Forecasting, Travel Demand, Scenarios, Trends, Transportation, Land Use, jel:H11, jel:R48
Abstract

This study uses accessibility as a performance measure to evaluate a matrix of future land use and network scenarios for planning purposes. The concept of accessibility dates to the 1950s, but this type of application to transportation planning is new. Previous research has established the coevolution of transportation and land use, demonstrated the dependence of accessibility on both, and made the case for the use of accessibility measures as a planning tool. This study builds off of these findings by demonstrating the use of accessibility-based performance measures in the Twin Cities Metropolitan Area. This choice of performance measure also allows for transit and highway networks to be compared side-by-side. For roadway modeling, zone-to-zone travel time matrix was computed using stochastic user equilibrium (SUE) assignment with travel time feedback to trip distribution. A database of schedules was used on the transit networks to assign transit routes. This travel time data was joined with the land use data from each scenario to obtain the employment, population, and labor accessibility from each traffic analysis zone (TAZ) within specified time ranges. Tables of person-weighted accessibility were computed for 20 minutes with zone population as the weight for employment accessibility and zone employment as the weight for population and labor accessibility. Maps of accessibility by zone were produced to show the spatial distribution of accessibility across the region. The results show that a scenario where population and employment growth are concentrated in the center of the metropolitan area would produce the highest accessibility no matter which transportation network changes are made. However, another scenario which concentrates population growth in the center of the metropolitan area and shifts employment growth to the periphery consistently outperforms the scenario representing the projected 2030 land use without any growth management strategy.

Published
2011

19. Network structure and travel.

Author

Parthasarathi, Pavithra Kandadai

Subjects
Network Structure, Travel Behavior, Civil Engineering
Abstract

Changing the design aspects of urban form is a positive approach to improving transportation. Land use and urban design strategies have been proposed to not only to bring about changes in travel behavior but as a way of providing a better quality of life to the residents. While the research on the relationship between urban form and travel behavior has been pretty extensive, there is a clear gap in the explicit consideration of the underlying transportation network, even though researchers acknowledge its importance. This dissertation aims to continue on the research interest in understanding travel behavior while explicitly accounting for the underlying transportation network structure. Transportation networks have an underlying structure, defined by the layout, arrangement and the connectivity of the individual network elements, namely the road segments and their intersections. The differences in network structure exist among and between networks. This dissertation argues that travelers perceive and respond to these differences in underlying network structure and complexity, resulting in differences in observed travel patterns. This hypothesized relationship between network structure and travel is analyzed in this dissertation using individual and aggregate level travel and network data from metropolitan regions across the U.S. Various measures of network structure, compiled from existing sources, are used to quantify the structure of street networks. The relation between these quantitative measures and travel is then identified using econometric models. The underlying principle of this research is that while the transportation network is not the only indicator of urban form and travel, an understanding of the transportation network structure will provide a good framework for understanding and designing cities. The importance of such an understanding is critical due to the long term and irreversible nature of transportation network decisions. The comprehensive analyses presented in this dissertation provide a clear understanding of the role of network design in influencing travel.

Published
2011

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