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Alternative delivery methods for transportation infrastructure projects, besides the traditional Design-Bid-Build (DBB) approach, have been implemented by private and public sectors since the last decades. The Texas Department of Transportation (TxDOT) is not the exception, and the fact that TxDOT has available alternatives for delivering its projects lead to the need of a formal decision process. This work presents the existent approaches made by different owner entities to formalize the delivery method decision. This research provides with decision procedures, criteria and principles to develop a quantitative decision-support tool; thus serving any entity seeking for a formalized and documentable Delivery Method decision procedure. A complete decision process was developed specifically for TxDOT, based on the literature review findings, but also on the agency's needs, experience and legal authority. This work intends to help the agency's staff make an informed choice between their available delivery methods: Design-Bid-Build and Design-Build. The decision method was formalized in the way of a Multiple Criteria Decision Making (MCDM) process, and organized as a MS Excel decision-support tool. The process incorporates knowledge --in the shape of performance scores-- from TxDOT experts as well as from other organizations that work closely with the agency. This input allows for the creation of a tool fully customized for TxDOT goals and projects' characteristics. The decision-support tool developed incorporates quantitative measures, but is transparent and flexible. It constitutes a rigorous, repeatable and documentable decision process, evaluating characteristics and goals of each project to determine each delivery method's suitability degree. Overall, the present works provides with guidelines for the development of a decision-support tool regarding the delivery methods decisions for any entity needing to formalize the process. It also specifically contributes to TxDOT, producing a formalized decision process that may be taken as an example for any other entity willing to modify and quantify their current Delivery Method selection procedure.
The selection of a project delivery method is a complex decision that can greatly affect the project outcome. Multiple methodologies have been developed to facilitate the selection for private entities as well as for public entities, like State Highway Agencies. The elements examined during the selection process include project characteristics, desired goals, institutional constraints, and the proper risk allocation. Within the highway sector, the principal choice of delivery method is between Design-Bid-Build, Design-Build, and Construction Manager/ General Contractor. In Texas, only the Design-Bid-Build and Design-Build methods are legislatively available. To ensure the effectiveness of the project delivery method selection, many State Highway Agencies have developed decision-making tools/ methodologies. Use of these tools allows the empirical investigation to refine our understanding of the factors that guide selection and their potential interactions. In particular, this study utilizes data from a quantitative tool developed for the Texas Department of Transportation. Since 2014, 57 projects have been evaluated by the tool, providing a large dataset for analysis. Specific findings identify the most impactful decision elements for each delivery method selection, such as site conditions and utility relocations for Design-Bid-Build and opportunity for innovation for Design-Build. Among the project characteristics, those most commonly selected as applicable include early project completion, site conditions, designer-contractor integration, and contractor better at handling third-party issues. Correlations measured among applicability of characteristics find some strong positive correlations, principally among the characteristics relating to innovation and designer-contractor integration. The emergence of need for innovation as a primary element of the decision is further examined by assessing the complexity of the evaluated projects through a Project Information Sheet distributed to TxDOT practitioners. The findings of this analysis indicated that complexity of design elements is highly correlated with innovation and that traffic challenges are the most common element increasing project complexity. These findings are also evaluated using importance weightings generated by an expert panel. The quantitative results are useful both for practitioners seeking to refine their project delivery method decision-making process and for researchers seeking a quantitative basis for future investigation
Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
NCHRP Report 662 describes how selected transportation agencies have reduced the time required to complete the project delivery process. This process takes new or renewed transportation facilities and services from conception to completion, ready for users. Project delivery is a primary indicator of an agency's effectiveness. Individual highway and other transportation projects are developed under programs intended to implement agency and legislative initiatives and other public policy. The way programs are organized and managed can determine the speed and efficiency of project development. Accelerating program functions can speed up project delivery. This report describes the experiences of eight state departments of transportation (DOTs) that made improvements in their project delivery and the lessons to be learned from their experiences. The information will be useful to DOT managers seeking to ensure that their agencies' organization, policies, and program operations facilitate project delivery.