- Simulation-Based Analysis of Sign Blanket Replacement Strategies , TRANSPORTATION RESEARCH RECORD (2020)
- Analysis of Three Sign Management Program Case Studies , PUBLIC WORKS MANAGEMENT & POLICY (2019)
- Closure to "Comparison of Three Retaining Wall Condition Assessment Rating Systems" by Mohammed A. Gabr, William Rasdorf, Daniel J. Findley, Cedrick J. Butler, and Steven A. Bert , JOURNAL OF INFRASTRUCTURE SYSTEMS (2018)
- Comparing the economic, energy, and environmental impacts of biodiesel versus petroleum diesel fuel use in construction equipment , International Journal of Construction Education and Research (2018)
- Comparison of three retaining wall condition assessment rating systems , Journal of Infrastructure Systems (2018)
- Highway Asset Deterioration Rates , TRANSPORTATION RESEARCH RECORD (2018)
- Simulation of Work Zones with Lane Closures in Proximity of Freeway Interchanges , IEEE INTELLIGENT TRANSPORTATION SYSTEMS MAGAZINE (2018)
- Approach to assessing tradeoffs between construction equipment fleet emissions and cost , Journal of Construction Engineering and Management (2017)
- Driver accuracy in identifying food and attraction targets on business logo signs impacts of driver age, number of panels, logo familiarity, and logo format , Transportation Research Record (2017)
- Driver performance and attention allocation in use of logo signs on freeway exit ramps , Applied Ergonomics (2017)
The purpose of this research is to assist the NCDOT Traffic Management Unit (TMU) and the Value Management Office (VMO) in assessing issues regarding the construction of Diverse, Modern, and Unconventional Intersections and Interchanges (DMUII). Assessing the constructability of these emerging DMUII is a new area of study that has not yet been previously explored. Therefore, this research will identify factors affecting construction projects prior to construction and develop a schedule and cost payout model (based on prior NCDOT projects) that identifies problems related to expenditure, schedule, and obstruction of traffic during construction.
The purpose of this research is to assess NCDOT traffic signal maintenance procedures and signal replacement cycle to benchmark their costs so that signal performance is maintained or enhanced and to develop a model for LED powered signal life span. This study answers the question ÃƒÂ¢Ã¢â€šÂ¬Ã…â€œwhat is the threshold at which an acceptable working LED traffic signal is in need of replacement?ÃƒÂ¢Ã¢â€šÂ¬Ã‚Â This study will explore whether or not a systematic signal replacement strategy could be developed and used by any division within NC to enhance performance, reduce waste, reduce cost, and be realistically and efficiently implemented.
The North Carolina State Institute, in its role as subcontractor to East Carolina University, will perform a total of $109,639 in contracted work from the period of August 2019 to July 2021. 1. Task 1. Kickoff Meeting. NC State will assist with the identification and scope of the research project. In addition, NC State will assist in the presentation of the data collection plan, methodologies for data analysis, and final products, as directed by ECU. 2. Task 2. Develop Literature Review on Best Practices. For this task, NC State will work collaboratively with ECU in the development of the literature review concerning best practices for conducting the constructability review process. Where appropriate, NC State will provide the relevant expertise and guidance. 3. Task 3. Schedule Stakeholder Meetings and Attend Constructability Review Meetings. will work collaboratively with ECU to schedule phone interviews with relevant stakeholders, focusing on those who have participated in previous constructability review meetings. In addition, NC State will lead the development of a comprehensive database of concerns raised by various project stakeholders (e.g., project owner, design engineers, general contractors, etc.) 4. Task 4. Refine Review Process and Establish Metrics. For this task, NC State will assist ECU in the development of constructability metrics and, where appropriate, establish new metrics for review. NC State will assist in the presentation of findings and metric recommendations to NCDOT. 5. Task 5. Develop Tracking Methods/Benefits Assessment Methodology and Tool. NC State will assist in the development of the tool methodology and action plan; NC State will lead in the database development. Finally, NC State will assist in the development of the draft constructability review tool which will be provided to NCDOT Value Management Office staff. 6. Task 6. Development of Action Plan and Spreadsheet Tool. NC State will assist in the refinement and development of the final constructability review tool to NCDOT staff. In addition, NC State will assist ECU in providing a final action plan report (with recommendations) to NCDOT.
Alternative Intersection and Interchange (AII) designs are those which provide an innovative approach to the geometric or control features which may improve operations and/or safety for different road users. In 2010, the U.S. Federal Highway Administration (FHWA) published the first edition of ÃƒÂ¢Ã¢â€šÂ¬Ã…â€œAlternative Intersection and Interchange Informational ReportÃƒÂ¢Ã¢â€šÂ¬Ã‚Â (AIIR), which provided information on six alternative treatments including displaced left-turn (DLT) intersections, restricted crossing U-turn (RCUT) intersections, median U-turn (MUT) intersections, quadrant roadway (QR) intersections, double crossover diamond (DCD) interchanges, and DLT interchanges. For each treatment, AIIR presented detailed information in a standardized format, including salient geometric design features, operational and safety issues, access management, costs, construction sequencing, environmental benefits, and applicability. The AIIR first edition has been employed by various agencies as a valuable resource for planning and designing AIIs, there are still unconventional design concepts that have not been fully explored and some of the current ones could use updates. During the past decade, there have been an increasing number of AIIs installed in the United States, and more new AII designs that are not documented in AIIR first edition have emerged since 2010, such as Reverse RCUTs, Partial Median U-turns, and Grade-Separated Alternative Intersections, etc. These new AII designs may involve different traffic organization patterns, which may introduce confusion and create safety hazards for drivers. NCDOT is a national leader in AII implementation, which provides safe, efficient, and cost-effective travel solutions for North Carolina drivers. Therefore, the primary objective of this research is to start the process of compiling the AIIR Second Edition. Specifically, this research will provide a state-of-the-practice literature review and expert interviews on AII designs, draft an annotated outline for the AIIR second edition, and develop an updated set of simulation models to assess the performance of various AII designs. Finally, this research will provide practical recommendations for planners and engineers to select site-specific AII designs during project processes.
Recent advances in small unmanned aerial systems (UASs) and sensing technologies have enabled relatively low cost and effective surveying methods for preconstruction, construction, and slope sites. However, the commercial software that accompanies these technologies produces inconsistent and unreliable survey results and there are no guidelines for ensuring the quality of the data. Without proper guidelines and specifications, repeated surveying at a designated area over time (e.g., construction site with periodic data collection) is not ideal.
Individual students applied for the DDETFP Fellowship. The selected student, their faculty advisor or campus program manager, and the institution 6 (ÃƒÂ¢Ã¢â€šÂ¬Ã…â€œRecipientÃƒÂ¢Ã¢â€šÂ¬Ã‚Â) will be responsible for completing and submitting all required paperwork to execute the fellowship. Funding will be sent to the Recipient on behalf of the Student Designee. The Recipient will be responsible for allocating funds to the student as outlined in the Budget of this Agreement. The Recipient will also be responsible for submitting all required reports to FHWA.
The Powell Bill Unit of the NCDOT annually distributes a fixed appropriation from the State Highway Fund to qualified North Carolina municipalities to maintain municipal streets within their corporate limits. The eligible activities covered by the funds include construction, planning, and maintenance on streets, sidewalks, bikeways, and greenways such as resurfacing, patching, widening, storm drainage, curb and gutter, and patching. It can also be used for municipal street bond debt service and traffic control such as traffic control devices, traffic signs, speed bumps, traffic paint, and traffic cones.
The purpose of this research is to assess alternate NCDOT roadway sign replacement strategies and to benchmark their costs so that sign performance is maintained or enhanced while lowering costs. This study answers the question ÃƒÂ¢Ã¢â€šÂ¬Ã…â€œis there an implementable lower cost sign replacement strategy that meets or exceeds current performance levels?ÃƒÂ¢Ã¢â€šÂ¬Ã‚Â This study will explore whether or not this strategy could consist of a systematic sign replacement strategy that can be used by any division within North Carolina.
Asset management is a relatively new concept in geotechnical engineering. In general, the nature of earth structures within the realm of highway engineering renders the concept of asset management a valuable tool for operation efficiency and cost control. Asset management includes a database of assets, tools to manage the database, asset condition assessment models, and strategies for assessment, mitigation, rehabilitation, and replacement. At present, there is no systematic tool to provide electronic documentation and analysis of earth structures including the retaining wall inventory maintained by the North Carolina Department of Transportation (NCDOT). The objective of this research is to design and develop a database archival and retrieval system for electronic documentation, management, qualitative analysis, and display of retaining walls, especially critical walls such as those adjacent to bridges. Such structures include MSE, soil-nail, tie-back, gravity, cantilever, and pile panel walls. The prototype database to be created will include wall location, geometry, internal configuration, local geology, and external signs of stress such as tilt and cracking. The development of rating criteria models that are specific to particular wall types will also be explored in consultation with NCDOT. The development of a systematic means for cataloging and condition assessment of highway retaining structures will represent a major contribution to the ability to establish effective and sustainable maintenance and replacement priorities. The primary project product is referred to herein as a database and includes a definition of all data tables and the attributes they contain. The final report will provide these definitions as well as sample data for 12 existing retaining walls populating all tables. Data collection procedures will include both wall spatial as well as wall attribute (characteristics) data. The spatial data will be organized in such a way as to be able to link to existing NCDOT systems. The proposed database (of key parameters defining the various types of retaining walls within the state) is intended to assist NCDOT engineers and contractors in evaluating the need for maintenance and replacement as well as capture often-lost assets for effective master planning, engineering, design, maintenance, and management of highway retaining structures.
The purpose of this proposal is to provide NCDOT with a design of a model to accurately portray construction costs of mega projects on a monthly basis. The model will track and document in-place cost and predict future costs based on NCDOTÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢s historical cost records for mega projects. It will also enable NCDOT to simulate changes in scheduling and depict the impact of those changes on payout costs. Finally it will enable NCDOT to identify projects that are deviating from their optimal cost payout curve pattern, pinpoint the factors causing that deviation, and allow NCDOT to be more proactive in making more informed cash flow management decisions. Key factors that influence the predictability of Preliminary Engineering (PE), Right-of-Way (ROW), and Construction expenditures for mega projects will be studied. A series of interviews will be conducted in the form of focus groups to help identify the key influencing factors that affect expenditure predictability for these categories. From these interviews a set of key variables will be identified that most significantly affect cost payouts. This phase will focus on the question of what factors will have the greatest influence in predicting project timeliness and cost. A qualitative assessment of the factors will be made and an assessment of their probability of impact will be determined for PE, ROW, and construction. The model design will include model objectives, data requirements and sources, approach/methodology, software platform, development and testing timeline, and expected performance parameters.