The most economical approach to maintain existing concrete bridges is by adopting an active preventive maintenance approach. An in-depth investigation of the combined deterioration effects of various deterioration mechanisms is needed to establish sound thresholds for harmful chemicals in concrete bridge elements.
Social media has become an integral part of modern communication. There is however no clear consensus among transportation managers on how social media could or should be used to collect or disseminate actionable information. To provide guidance on the potential use of social media in transportation, a better understanding is needed of the message content as well as the path taken from the sender to the potential user of actionable information during crises and other non-routine events in the transportation system.
This project lays the foundation for building and exchange hub for locational and security data and risk assessment of potential excavation work. It acts primarily at 2 stages: upstream of the mark-out process, as a decision support tool to help streamline, improve and guide the mark-out process, and downstream of the mark-out to gain and preserve information gained from such field verified data, and added intelligence to each utility asset management system related to the potential proximity of other utilities, and possible criticality of proposed construction activity in a given sit
This paper presents a new conceptual approach to improve the operational performance of public bike sharing systems using pricing schemes. Its methodological developments are accompanied by experimental analyses with bike demand data from Capital Bikeshare program of Washington, DC. An optimized price vector determines the incentive levels that can persuade system customers to take bicycles from, or park them at, neighboring stations so as to strategically minimize the number of unbalanced stations.
Transportation planners and traffic engineers are increasingly turning to crash reduction factors to evaluate changes in road geometric and design features in order to reduce crashes. Crash reduction factors are typically estimated based on segmenting a highway and associating crashes with geometric features; this allows statistical methods to be applied to the data.
This project presents a comprehensive investigation about the network effects of MF to facilitate the developments of proper MF policies. After a practice scan and a review of the recent literature on MF, a multiclass mathematical programming with equilibrium constraint (MC-MPEC) is proposed to capture the optimal MF charging problem from a network perspective. The MC-MPEC problem is then solved and tested on two illustrative networks to show the MF network effect.
Major State Departments of Transportation operate and maintain networks of thousands of miles of conduits, many carrying fiber optic cables that are vital to State communication systems. These conduits are located alongside or across highways and frequently must be located and marked to avoid damage from digging or boring resulting from construction.
Public Private Partnership (P3) projects are likely to fundamentally impact entire transportation systems. However, most studies are focused on system modeling rather than policy analysis, and few studies have examined the impacts of P3s on real-size transportation networks. Policy guidance for devising and administering P3 contracts to improve transportation system performance while maintaining profitability is lacking.
This report develops a methodology for estimating the effects of different categories of overweight trucks on NYSDOT pavements and bridges. A data mining algorithm is used to categorize truck data collected at several Weigh-In-Motion stations around the state of New York based on the trucks’ adherence to the state’s legal weight limits. The data indicate that about 11% of the trucks traveling on New York highways may be carrying divisible load permits, 1% may be carrying special hauling permits, while about 6% may be illegally overweight.
This study suggests an integrated framework to quantify cyber attack impacts on the U.S. airport security system. A cyber attack by terrorists on the U.S. involves complex strategic behavior by the terrorists because they could plan to invade an airport electronic system without any U.S. border or entry point. At the same time, any defending entity must consider the complex processes that may cause turmoil. The possibility of simultaneous threats from cyber attacks causes another difficulty for defending entities to secure their airports.
