Education

Research Description

Dr. Rasdorf is interested in structures, construction, transportation, manufacturing, and computer-aided engineering. Facility design methods. Engineering databases and information processing and technology. Automated representation, use, and management of analysis, design, manufacture, and construction data. Modeling of engineering objects, processes, assemblies, and phenomena. Integration among engineering processes and information systems. Modeling and processing of design, product and process data, material property standards and specifications, design codes, and regulations. Computer-aided design and geometric and spatial modeling and analysis in engineering. Information technology applications in problem solving, design, construction, manufacturing, and transportation. Constructed facility life cycle automation through the integration of software, hardware, sensing, and information and communication technologies. Planning, design, and construction automation. Environmental impacts in construction.

Publications

Inequity Reduction in Road Maintenance Funding for Municipalities

Bonilla, M., Rasdorf, W., Liu, M., Al-Ghandour, M., & He, C. (2023), PUBLIC WORKS MANAGEMENT & POLICY, 28(3), 339–362. https://doi.org/10.1177/1087724X221130047

LED Traffic Signal Repair and Replacement Practices

Westbrook, M., & Rasdorf, W. (2023), SUSTAINABILITY, 15(1). https://doi.org/10.3390/su15010808

Assessment and Prediction of Impact of Flight Configuration Factors on UAS-Based Photogrammetric Survey Accuracy

Liu, Y., Han, K., & Rasdorf, W. (2022), REMOTE SENSING, 14(16). https://doi.org/10.3390/rs14164119

Inequity Reduction in Road Maintenance Funding for Municipalities

Bonilla, M., Rasdorf, W., Liu, M., Al-Ghandour, M., & He, C. (2022, September 27), PUBLIC WORKS MANAGEMENT & POLICY, Vol. 9. https://doi.org/10.1177/I087724X221130047

Analysis of Three Sign Management Program Case Studies

Machado, P., & Rasdorf, W. (2020), PUBLIC WORKS MANAGEMENT & POLICY, 25(1), 51–74. https://doi.org/10.1177/1087724X19862285

Simulation-Based Analysis of Sign Blanket Replacement Strategies

Rasdorf, W., & Machado, P. (2020), TRANSPORTATION RESEARCH RECORD, 2674(1), 57–67. https://doi.org/10.1177/0361198119898110

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

Gabr, M. A., Rasdorf, W., Findley, D. J., Butler, C. J., & Bert, S. A. (2018, December), JOURNAL OF INFRASTRUCTURE SYSTEMS, Vol. 24. https://doi.org/10.1061/(ASCE)IS.1943-555X.0000447

Comparing the economic, energy, and environmental impacts of biodiesel versus petroleum diesel fuel use in construction equipment

Lewis, P., Karimi, B., Shan, Y., & Rasdorf, W. (2018), International Journal of Construction Education and Research, 15(4), 276–290. https://doi.org/10.1080/15578771.2018.1483982

Comparison of Three Retaining Wall Condition Assessment Rating Systems

Gabr, M. A., Rasdorf, W., Findley, D. J., Butler, C. J., & Bert, S. A. (2018), JOURNAL OF INFRASTRUCTURE SYSTEMS, 24(1). https://doi.org/10.1061/(asce)is.1943-555x.0000403

Highway Asset Deterioration Rates

Rasdorf, W., & Almalki, A. (2018), TRANSPORTATION RESEARCH RECORD, 2672(12), 179–186. https://doi.org/10.1177/0361198118781136

View all publications via NC State Libraries

Grants

Evaluating Benefits and Drawbacks of Intersections with Three-Phase Traffic Signals

NC Department of Transportation(8/01/22 - 7/31/24)

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Evaluating Benefits and Drawbacks of Intersections with Three-Phase Traffic Signals

Sponsor: NC Department of Transportation

Start Date: 8/01/22

End Date: 7/31/24

Abstract

The purpose of this research is to add new insights regarding the benefits and drawbacks of using intersections with three-phase traffic signals compared to other intersection designs and to develop a technical guideline to help designers and policymakers in transportation understand when and where to use three-phase designs. At four-phase conventional intersections where traffic demand is near or above capacity, innovative intersections may perform better. New designs with two-phase traffic signals such as reduced conflict intersections (RCI, also called RCUT and superstreet) result in shorter travel times, fewer crashes, and better pedestrian service in North Carolina (NC). However, retrofits to designs with two-phase signals may be impactful and unpopular. Higher minor street demand, lack of precedent, and complaints (from neighbors, business owners, politicians, media, etc.) are among the possible obstacles for constructing two-phase designs in many locations. In other words, while two-phase intersections perform very well at many intersections, designers might not be able to select those designs for some projects. On the other hand, intersections with three-phase signals might provide some of the two-phase design advantages while also providing more direct movements and alleviating some public concerns. This study seeks to answer the following questions: (1) At what locations are three-phase designs most well suited? (2) How much do they cost, especially compared with other intersections like RCIs? (3) What kind of traffic control devices (pavement markings, traffic signs, and traffic signals) are needed? (4) What movement restrictions could cause motorist confusion and violations? (5) How could we minimize those violations? (6) What are the considerations needed for pedestrian and bicyclist safety? (7) What kind of geometric and right-of-way (ROW) limitations are faced during construction? (8) What movements are less impactful for redirecting in different cases? (9) What designs would be most readily accepted by the public? Current literature on innovative intersections with three-phase signals is limited. Excluding offset, partial continuous-flow intersections (CFIs), and quadrant intersections, (three common three-phase designs in NC) little information is available on the performance of other three-phase intersections. Reviewing the Crash Modification Factors (CMF) Clearinghouse reveals that only a few studies have estimated CMFs for converting four-phase conventional intersections to three-phase intersections. These studies focused on partial CFIs and partial median U-turn intersections (MUTs). Other possible three-phase designs should also be evaluated to increase the confidence level in selecting the most appropriate design. A recent presentation by NCDOT’s Dr. Joseph Hummer introduced ten three-phase intersections as possible candidates for future projects. Based on initial evaluations, the ten three-phase designs could show potential in improving existing intersections. The research team also proposes another new three-phase design which could be considered as a promising design. The proposed three-phase intersection redirects two left-turn and one through movements. It is expected to experience higher capacity for the proposed design compared to conventional intersection due to better signal progression and a lower volume to capacity (v/c) ratio. Also, the proposed design has 19 conflict points. Only two of the existing three-phase designs (reverse RCI and offset intersections) have fewer conflict points compared to the proposed design. This proposed study focuses on the following three-phase designs: partial MUTs, partial CFIs, reverse RCIs, thru- cuts, offset, quadrant, CFI/MUT combo, redirect one minor leg, redirect minor lefts, seven-phase signal, and redirect two lefts and a through intersection (see Figure 1 in the body of the proposal). Also, the research team will consider other new designs, especially where another proposed design might perf

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Dwight David Eisenhower Transportation Fellowship Program (DDETFP) Graduate Fellowship (Minerva Bonilla Ventura)

US Dept. of Transportation (DOT)(12/10/20 - 8/31/21)

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Dwight David Eisenhower Transportation Fellowship Program (DDETFP) Graduate Fellowship (Minerva Bonilla Ventura)

Sponsor: US Dept. of Transportation (DOT)

Start Date: 12/10/20

End Date: 8/31/21

Abstract

Individual students applied for the DDETFP Fellowship. The selected student, their faculty advisor or campus program manager, and the institution 6 (“Recipient”) 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.

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Groundwork for the Second Edition of the Alternative Intersection and Interchange Informational Report (2022-011)

NC Department of Transportation(8/01/21 - 8/31/23)

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Groundwork for the Second Edition of the Alternative Intersection and Interchange Informational Report (2022-011)

Sponsor: NC Department of Transportation

Start Date: 8/01/21

End Date: 8/31/23

Abstract

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 “Alternative Intersection and Interchange Informational Report” (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.

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Guidelines to Enhance the Constructability of Diverse, Modern, and Unconventional Intersections and Interchanges (DMUII)

NC Department of Transportation(1/01/21 - 8/14/23)

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Guidelines to Enhance the Constructability of Diverse, Modern, and Unconventional Intersections and Interchanges (DMUII)

Sponsor: NC Department of Transportation

Start Date: 1/01/21

End Date: 8/14/23

Abstract

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.

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LED Traffic Signal Lifespan and Replacement Assessment

NC Department of Transportation(1/01/21 - 12/31/23)

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LED Traffic Signal Lifespan and Replacement Assessment

Sponsor: NC Department of Transportation

Start Date: 1/01/21

End Date: 12/31/23

Abstract

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 “what is the threshold at which an acceptable working LED traffic signal is in need of replacement?” 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.

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Constructibility Review Effectiveness

NC Department of Transportation(7/01/19 - 12/31/22)

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Constructibility Review Effectiveness

Sponsor: NC Department of Transportation

Start Date: 7/01/19

End Date: 12/31/22

Abstract

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.

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Applying Small UAS to Produce Survey Grade Geospatial Products for DOT Preconstruction & Construction Activities

NC Department of Transportation(8/01/19 - 10/31/21)

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Applying Small UAS to Produce Survey Grade Geospatial Products for DOT Preconstruction & Construction Activities

Sponsor: NC Department of Transportation

Start Date: 8/01/19

End Date: 10/31/21

Abstract

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.

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How to Account for Seasonal Population Shifts in Distributing the Powell Bill Allocation Funds

NC Department of Transportation(8/01/18 - 1/31/20)

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How to Account for Seasonal Population Shifts in Distributing the Powell Bill Allocation Funds

Sponsor: NC Department of Transportation

Start Date: 8/01/18

End Date: 1/31/20

Abstract

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.

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Sign Replacement Strategy

NC Department of Transportation(7/01/17 - 5/31/19)

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Sign Replacement Strategy

Sponsor: NC Department of Transportation

Start Date: 7/01/17

End Date: 5/31/19

Abstract

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 “is there an implementable lower cost sign replacement strategy that meets or exceeds current performance levels?” 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.

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Design of A Construction Expenditure Forecasting and Monitoring Tool for NCDOT Mega Projects

NC Department of Transportation(10/01/14 - 6/30/15)

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Design of A Construction Expenditure Forecasting and Monitoring Tool for NCDOT Mega Projects

Sponsor: NC Department of Transportation

Start Date: 10/01/14

End Date: 6/30/15

Abstract

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 NCDOT’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.

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