Browsing by Subject "Advanced traveler information systems"
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Item Arterial Link Travel Time Estimation Using Loop Detector Data - Phase I(Center for Transportation Studies, University of Minnesota, 1997-05) Zhang, Michael; Wu, Tong Qiang; Kwon, Eil; Sommers, Kevin; Habib, AhsanIn recognition of the need for an effective yet inexpensive way of estimating arterial travel times, MnDOT has sponsored a research project to develop a travel time estimation model using loop detector data. This project is being jointly conducted by researchers from the University of Iowa and the University of Minnesota, and will be carried out in two phases. Phase I involves a literature review, traffic data collection and development of a travel time database, and Phase II covers model development, calibration and evaluation. This report summarizes the findings of Phase I.Item Improving Carsharing and Transit Service with ITS(Minnesota Department of Transportation, 2008-09) Douma, Frank; Gaug, Ryan; Horan, Tom; Schooley, BenThis report examines Intelligent Transportation Systems (ITS) as they apply to carsharing and transit. Two modes that provide mobility to those who do not own a car. In the first study, researchers developed and administered a survey to members of HOURCAR, a local not-forprofit carsharing organization (CSO), and a randomly selected control group. The data reveals that (1) each HOURCAR removes 2.5 other vehicles; (2) HOURCAR members demonstrate an interest in deciding whether a car is their most efficient option for their trip, (3) HOURCAR respondents were not significantly different from the control group in terms of household size, income, age or housing type; and (4) most members indicated convenience and financial considerations were key to joining. The second study seeks to understand how citizen perceptions of trust and confidence in an agency, and its services, are impacted by the use of advanced traveler information systems (ATIS), specifically, an online trip planner developed and maintained by MetroTransit. A survey and focus group indicate connections between online use and perceptions about the agency. Notably, a strong positive view of the trip planner was associated with trust in the agency to perform the service.Item Storage and Access Methods for Advanced Traveler Information Systems(Minnesota Department of Transportation, 1996-04) Shekhar, Shashi; Liu, Duen-RenThis report examines the use of the Connectivity-Clustered Access Method (CCAM) to improve network operations. The expected I/O cost for many network operations can be reduced by maximizing the Weighted Connectivity Residue Ratio (WCRR), i.e., the chance that a pair of connected nodes that are more likely to be accessed together are allocated to a common page of the file. An access method for general networks that uses connectivity clustering, CCAM supports the operations of insert, delete, create, and find, as well as the new operations, get-A-successor and get-successors, which retrieve one or all successors of a node to facilitate aggregate computations on networks. The nodes of the network are assigned to disk pages via a graph partitioning approach to maximize the WCRR. CCAM includes methods for static clustering, as well as dynamic incremental reclustering, to maintain high WCRR in the face of updates, without incurring high overheads. The report also describes possible modifications to improve the WCRR that can be achieved by existing spatial access methods. Experiments with network computations on the Minneapolis road map show that CCAM outperforms existing access methods, even though the proposed modifications also substantially improve the performance of existing spatial access methods.Item Traffic Data Management for Advanced Driver Information Systems(Minnesota Department of Transportation, 1995-05) Shekhar, ShashiAdvanced Traveler Information Systems (ATIS) offer the potential to help a driver find the quickest and safest route to a destination. An effective navigation system requires effective route planning services, which need to provide three facilities: route computation, route evaluation, and route display. This project focuses on route planning algorithms for ATIS. The cost models and performance studies in this report show that single-pair algorithms can outperform traditional algorithms in many situations.