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You searched for subject:(work zone impact). Showing records 1 – 2 of 2 total matches.

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1. Tiwari, Shashank. Quantifying Road User Costs with Heterogeneous Value of Motorists' Travel Time.

Degree: MS, Construction Management, 2013, Texas A&M University

The state transportation agencies (STAs) in the United States are mandated by federal rule to carry out work-zone impact assessment for highway rehabilitation projects. The work zone impact assessment requires calculating road user costs (RUCs) which is the sum of vehicle operating costs, accident costs, and value of time (VOT). The term ‘value of time’ refers to monetary equivalent of travel time wasted due to rehabilitation projects. In current practice, STAs assume VOT as homogeneous within their respective states. This leads to inaccurate RUCs calculations and poses many misapplications. Research has found that VOT is influenced by socio-demographic variables which vary within the states. But there is a lack of framework to evaluate the extent to which these factors affect value of time. The major objective of this research is to develop and validate a model that predicts value of time heterogeneously. The data were collected to cover 20 major cities in California. The state of California was chosen for this study because most highway rehabilitation projects are carried out there. The data sources included the United States Census Bureau, the California Department of Transportation (Caltrans), and the Bureau of Labor Statistics. With these data, a predictive model was developed using multiple linear regression analysis. Lastly, the model was validated using PRESS statistic. The results reveal that age, annual average daily traffic, and effective hourly income were the most significant factors influencing value of time. This study developed a model which will help Caltrans in calculating value of time heterogeneously and therefore, improve the accuracy of RUCs calculations. Moreover, this research will serve as a guideline for other STAs to develop models for respective states. Therefore, this model has a potential to greatly improve the accuracy of value of time and therefore, RUCs. The future research should focus on the identified factors, especially cost-of-living index and annual average daily traffic. Further research is required to account for heterogeneity due to other factors such as vehicle occupancy, frequency of travel, and educational qualifications. Advisors/Committee Members: Choi, Kunhee (advisor), Solis, Jose Fernandez (committee member), Rybkowski, Zofia (committee member), Kim, Jun Hyun (committee member).

Subjects/Keywords: Value of Time; Road User Costs; Work-zone Impact

work zone impact analysis (Sankar et al. 2006). The work zone impact is evaluated… …which forms the basis of assessing work zone impact due to highway rehabilitation projects. 2… …influenced the result of this study. 14 2.6 Significance of Study To carry out work zone impact… …perform work zone impact analysis for highway rehabilitation projects which were undertaken… …required to carry out work zone impact analysis for highway rehabilitation projects to ensure… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Tiwari, S. (2013). Quantifying Road User Costs with Heterogeneous Value of Motorists' Travel Time. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151336

Chicago Manual of Style (16th Edition):

Tiwari, Shashank. “Quantifying Road User Costs with Heterogeneous Value of Motorists' Travel Time.” 2013. Masters Thesis, Texas A&M University. Accessed March 04, 2021. http://hdl.handle.net/1969.1/151336.

MLA Handbook (7th Edition):

Tiwari, Shashank. “Quantifying Road User Costs with Heterogeneous Value of Motorists' Travel Time.” 2013. Web. 04 Mar 2021.

Vancouver:

Tiwari S. Quantifying Road User Costs with Heterogeneous Value of Motorists' Travel Time. [Internet] [Masters thesis]. Texas A&M University; 2013. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1969.1/151336.

Council of Science Editors:

Tiwari S. Quantifying Road User Costs with Heterogeneous Value of Motorists' Travel Time. [Masters Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151336

2. Mackley, Andrew R. Use of incentive/disincentive contracting to mitigate work zone traffic impacts.

Degree: 2012, University of Missouri – Columbia

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Incentive/disincentive clauses (I/D) are designed to award payments to contractors if they complete work ahead of schedule and to deduct payments if they exceed the completion time. A previously unanswered question is, "Did the costs of the actual work zone impacts that were avoided justify the incentives paid?" This paper answers that question affirmatively based on an evaluation of 20 I/D projects in Missouri from 2008 to 2011. Road user costs (RUC) were used to quantify work zone impacts and included travel delays, vehicle operating costs, and crash costs. These were computed using work zone traffic conditions for partial‐closure projects and detour volumes and routes for full‐closure projects. Conditions during construction were compared to after construction. Crash costs were computed using Highway Safety Manual methodology. Safety Performance Functions produced annual crash frequencies that were translated into crash cost savings. In considering an average project, the percentage of RUC savings was around 13% of the total contract amount, or 444,389 of 3,464,620. I/D provisions were very successful in saving RUC for projects with full-closure, projects in urban areas, and emergency projects. Rural, non-emergency projects successfully saved RUC but not at the same level as other projects. The I/D contracts were also compared to all Missouri Department of Transportation contracts for the same time period. The results show that I/D projects had a higher on-time completion percentage and a higher number of bids per call than average projects. But I/D projects resulted in 4.52% higher deviation from the project budget and possibly more changes made after the award. A survey of state transportation departments and contractors showed that both agreed to the same issues that contribute to the success of I/D contracts. Overall, in terms of work zone impact mitigation, I/D contracts are very beneficial at a relatively low cost. Advisors/Committee Members: Sun, Carlos (advisor), Edara, Praveen K. (Praveen Kumar) (advisor).

Subjects/Keywords: work zone impact; road user costs; road construction; contractor incentives

…success of I/D contracts. Overall, in terms of work zone impact mitigation, I/D contracts are… …details, see Appendix A. 5. WORK ZONE IMPACT METHODOLOGY The primary way I/D contracts minimize… …completion time. A previously unanswered question is, “Did the costs of the actual work zone… …x28;RUC) were used to quantify work zone impacts and included travel delays, vehicle… …operating costs, and crash costs. These were computed using work zone traffic conditions for… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mackley, A. R. (2012). Use of incentive/disincentive contracting to mitigate work zone traffic impacts. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/33248

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Mackley, Andrew R. “Use of incentive/disincentive contracting to mitigate work zone traffic impacts.” 2012. Thesis, University of Missouri – Columbia. Accessed March 04, 2021. http://hdl.handle.net/10355/33248.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Mackley, Andrew R. “Use of incentive/disincentive contracting to mitigate work zone traffic impacts.” 2012. Web. 04 Mar 2021.

Vancouver:

Mackley AR. Use of incentive/disincentive contracting to mitigate work zone traffic impacts. [Internet] [Thesis]. University of Missouri – Columbia; 2012. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10355/33248.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mackley AR. Use of incentive/disincentive contracting to mitigate work zone traffic impacts. [Thesis]. University of Missouri – Columbia; 2012. Available from: http://hdl.handle.net/10355/33248

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.