Abstract:
Road pricing has widely been considered by system planners for relieving congestion and generating revenue. The design and evaluation of different road pricing schemes are always necessary for the decision makers to ensure the potential beneficiary of road pricing and the practical implementation of the scheme. This study presents an evaluation procedure based on the use of continuum modeling approach for addressing the road pricing feasibility problem in Baltimore Metropolitan Region. In this study, Baltimore City is considered as the central business district (CBD) and the corresponding user-equilibrium, system-optimal and cordon-based charging models are setup and solved. Sensitivity analyses of total demand, total toll collected, social benefit and the location/shape of the charging cordons for this proposed model with respect to the input parameters are also completed. The study demonstrates the potential applicability of using continuum modeling approach for road pricing feasibility study in Baltimore Metropolitan Region.
Author: Gang-Len Chang & Zhuan Li
Date: June 2010
Authors: Xianfeng Yang , Yang Lu & Gang-Len Chang
Date: March 2011
Authors: Gang-Len Chang, Ying Liu , Ali Haghani , Abbas M. Asshar
Date: June 2007
Author: Elham Sharifi
Date: 2008
Introduction
The Lane Closure Analysis Program (referred to as LCAP) is developed for the Maryland State Highway Administration by the University of Maryland. This study intends to develop an advanced model for estimating work-zone capacities and produce an integrated and user-friendly computer program for SHA engineers/staff to analyze a variety of work-zone associated issues, including guidelines for work zone design, and methodologies for capacity estimation, traffic impact analysis, cost/benefit evaluation, lane-closure penalty assessment, as well as incentive/disincentive estimates for various implementation plans.
Versions
LCAP v1.2 now has two versions, Basic and Pro versions. The Basic version provides users tools for quick estimation of the delay caused by work-zones with its integrated capacity model, which is developed and calibrated with Maryland¡¯s driving behaviors. The Pro version integrates a microscopic simulation module, which can estimate the impact of the work-zone with consideration of more factors, including complex geometry features and drivers interaction to work-zone warning signs and traffic conditions.
LCAP v1.3 Basic (Executable Only) (last update: 09/26/2019)
LCAP v1.3 Basic Package (last update: 09/26/2019)
LCAP v1.2 Pro (Executable Only) (last update: 10/5/2009)
LCAP v1.2 Pro Setup Package (last update: 03/3/2009)
Authors: Xianfeng Yang, Yao Cheng and Gang-len Chang
Journal: Transportation Research Part C, 2015
Abstract:
To contend with congestion and spillback on commuting arterials, serving as connectors between freeway and surface-street flows, this paper presents three multi-path progression models to offer progression bands for multiple critical path-flows contributing to the high volume in each arterial link. The first proposed model is a direct extension of MAXBAND under a predetermined phasing plan, but using the path-flow data to yield the progression bands. The second model further takes the phase sequence at each intersection as a decision variable, and concurrently optimizes the signal plans with offsets for the entire arterial. Due to the competing nature of multi-path progression flows over the same green duration, the third model is proposed with a function to automatically select the optimal number of paths in their bandwidths maximization process. The results of extensive simulation studies have shown that the proposed models outperform conventional design methods, such as MAXBAND or TRANSYT, especially for those arterials with multiple heavy path-flows. The research results from this study have also reflected the need to collect more traffic pattern data such as major path-flow volumes, in addition to the typical intersection volume counts.
Authors: Kyeong-Pyo Kang , Gang-Len Chang and Nan Zou
Journal: Transportation Research Record, No. 1877, 2004
Abstract:
Despite the well recognized fact that a proper control of traffic speed can contribute to both reduction in accidents and efficiency of highway operations, most existing speed control strategies implemented in Europe and U.S. tend to aim only at improving traffic safety. This research intends to present an on-line algorithm for variable speed limit (VSL) control at highway work zones that can take full advantage of its dynamic functions and concurrently achieve the objectives of throughput maximization as well as accident minimization.
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