Browsing by Author "Tighe, Susan L."
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- Accelerated Testing and Instrumentation: A Canadian Case StudyTighe, Susan L. (2015-06-04)The primary objective of this paper is to describe how the CPATT Test Track is used to advance Canadian pavement engineering practices through the investigation of the impact of axle loads and environment on flexible and rigid pavement structures. It also discusses how the Track is used as an educational tool for both undergraduate and graduate students. Since construction, over 1,000 undergraduate and graduates have not only visited the Test Track, but have used the data from the Test Track for course assignments and other research. It has been a valuable and strategic asset for both research and education.
- Advancing Pavement Surface Evaluation to Support Engineering and Investment DecisionsDaleiden, Jerome; Burchett, Thomas; Mergenmeier, Andy (2015-05-01)The American Association of State Highway and Transportation Officials (AASHTO's) Pavement Rutting and Cracking Quantification Expert Task Group (ETG) was formed in 2006 with Federal Highway Administration (FHWA) funding to provide program guidance and assistance in development and enhancement of standards for pavement rutting and asphalt pavement surface cracking. The ETG was formed with subject matter experts to represent AASHTO, FHWA, the American Society for Testing and Materials (ASTM) Committee E-17 on Vehicle-Pavement Systems, Transportation Research Board (TRB), the Long Term Pavement Performance (LTPP) Program, academia, and industry. Revised data collection and analysis protocols have been produced and evaluations are being initiated to identify how best to continue the development process.
- AERIS: Eco-driving Application Development and TestingRakha, Hesham A.; Ahn, Kyoungho; Park, Sangjun (United States. Department of Transportation. Research and Innovative Technology Administration, 2012-06)This exploratory study investigates the potential of developing an Eco-Driving application that utilizes an eco-cruise control (ECC) system within state-of-the-art car-following models. The research focuses on integrating predictive cruise control and optimal vehicle acceleration and deceleration controllers within car-following models to minimize vehicle fuel consumption levels. This system makes use of topographic information, spacing to lead vehicle, and a desired (or target) vehicle speed and distance headway as input variables.
- Human Factors Evaluation of Level 2 and Level 3 Automated Driving Concepts: Concepts of OperationMarinik, Andrew; Bishop, Richard; Fitchett, Vikki L.; Morgan, Justin F.; Trimble, Tammy E.; Blanco, Myra (United States. National Highway Traffic Safety Administration, 2014-07)The Concepts of Operation document evaluates the functional framework of operations for Level 2 and Level 3 automated vehicle systems. This is done by defining the varying levels of automation, the operator vehicle interactions, and system components; and further, by assessing the automation relevant parameters from a scenario-based analysis stand-point. Specific to the “Human Factors Evaluation of Level 2 and Level 3 Automated Driving Concepts" research effort, scenarios and literature are used to identify the range of near- to mid-term production-intent systems such that follow-on research topics with highest impact potential can be identified through commonalities in operational concepts.
- Improving Airport Pavement Management Using An Analytical Hierarchy Process Decision Making ToolPinto, Samantha T.; Tighe, Susan L. (2015-06-04)This paper discusses how an Airport Pavement Management System (APMS) can be used by airport operators to help improve maintenance scheduling and decision making. The steps involved in creating an APMS are outlined from establishing a pavement history to maintaining the system with current information. Opportunities are identified for utilizing the APMS to analyze trends in pavement distresses and evaluate the effectiveness of competing maintenance treatments. This paper also introduces an Analytical Hierarchy Process (AHP) as a tool that can be incorporated in an APMS and utilized for decision making. An AHP offers a systematic approach to incorporating both qualitative and quantitative factors in the assessment of competing alternatives to provide an innovative solution. A runway surface texture and rubber removal case study is presented. In this case study, it is shown that the state of the art practice testing frequency can be greatly improved with access to data. The importance of runway friction is described and four options for removing rubber accumulation and restoring texture to a runway are presented to provide context for applying this case to an AHP. The paper concludes by showing how an AHP can be incorporated into an APMS to help an operator compare maintenance techniques and select the most suitable alternative based on their airport's needs. The concept of an AHP can be broadly applied to decision making within an APMS.
- Long-Term Pavement Performance (LTPP) InfoPave: Extracting Practical Information out of the DataAhmad, Riaz; Daleiden, Jerome; Kargah-Ostadi, Nima (2015-05-20)Long-Term Pavement Performance (LTPP) InfoPave is the web interface for the world's largest pavement performance database. This web interface is being developed under the Federal Highway Administration (FHWA) LTPP program to achieve the strategic goal of utilizing LTPP data effectively. An effective web interface helps reach users crossing all levels of expertise and geographical boundaries and helps information sharing which adds value to tax payers' dollars. To overcome the hurdles for easy data access, the initial phase of the LTPP InfoPave development considered effective ways of data design including organizing the data for the user, expanding data to the unit (test section) level, developing consistent terminology and metadata, and using familiar pavement engineering names for tables and fields in the database. The design of the data warehouse and development of feature mechanisms were centered on the efficient data structure model. Feedback obtained at each major step of development helped create this web interface. LTPP InfoPave, released during the 93rd annual meeting of the Transportation Research Board (TRB) in January 2014, has received positive response from students, researchers, State DOT engineers, and stakeholders alike. The second release of InfoPave in January 2015 includes major enhancements to existing features and a series of new features, which implement novel visualization tools to further facilitate access to LTPP data. The application of LTPP InfoPave enhances data visualizing, selection, and access. This paper will layout data analysis examples, which demonstrate the utility of InfoPave in providing answers to pavement performance questions. Plans for future improvements and implementation will be discussed as well.
- Performance Measures for Pavement Assets under Performance Based ContractsAlyami, Zaid; Tighe, Susan L.; Gransberg, Douglas D.; Bianchin, Maria (2015-06-04)Over the past decade, there has been a movement in North America towards Performance Based Contracts (PBC). In PBCs, the client agency specifies defined minimum performance measures to be met or exceeded during the contract period. PBC operates through a continuing performance measurement and review systems against a set of minimum level of services (LOS). Therefore, performance measures in contract administration are fundamental to the successful usage of this type of contract. The paper presents a review of PBC focusing on performance measures. A review of the current state-of-the-practice is conducted to identify key performance measures employed by various agencies. In addition, a literature review of several road agencies in North America is conducted to evaluate the important physical attributes agencies are using as performance inputs to evaluate the overall condition of the road assets. Moreover, the study provides a review of performance specifications implemented by the Ministry of Transportation in Ontario (MTO) including Pavement with Warranty and Minimum Oversight Contracts. A monitoring framework of performance measures is presented. Finally, recommended performance measures for flexible, rigid pavements and granular shoulders are presented for the use in MTO's PBCs.