Institute for Transportation

About the research

GeoTechTools (www.geotechtools.org) is a web-based information and guidance system for geotechnical solutions for transportation infrastructure. This SHRP2 solution, developed under project R02, provides a framework for selecting appropriate geo-construction and ground improvement technologies to use for site-specific project conditions and constraints. For each of more than 50 technologies, significant technical and cost information is provided that allows users to complete feasibility, design, quality assurance, and preliminary cost studies; most of this information is provided in several PDF files for each technology. A key feature of the system is a technology selection/workflow tool that poses questions about geotechnical project conditions to the user and identifies applicable technologies based on the responses.

The primary objective of this project is to upgrade the GeoTechTools website platform from its current ColdFusion 10 platform to one that includes a content management system (CMS) that would allow non-technical users to update web content. Additionally, this update will improve the functionality and capabilities of the present system so users can better navigate the system and optimize the website for viewing and interaction experience across a full range of digital devices (desktops to mobile phones).

About the research

About the research

This multi-phase study utilized Second Strategic Highway Research Program (SHRP2) Naturalistic Driving Study (NDS) data to evaluate the impact of traffic control devices in reducing driver speed in work zones. The main advantage to the SHPR2 NDS data is that on-road driver behavior was captured and can be used to evaluate how drivers behave in various situations. The study included four different analyses. The first evaluated where drivers began reacting to various work zone traffic control devices. The second assessed how drivers changed speed upstream to immediately downstream as they encountered various traffic control devices. The third assessed how drivers react when they encounter the back of a queue and the fourth developed speed based on work zone characteristics such as presence of barriers.

The project also includes a toolbox that summarizes information about work zone traffic control devices, countermeasures, and work zone features that have a demonstrated impact on speed in work zones. Features were identified through a survey of the literature. Additional information for some of the features and countermeasures was gained through the various analyses of SHRP2 data conducted through this project. Guidance from the work zone traffic control manuals for various states was summarized when appropriate. Recommendations for use of each feature or countermeasure relevant to addressing speed in work zones was developed by the team and reviewed by work zone experts and the project panel.

About the research

The objective of this research is to develop a guidebook, for use by departments of transportation (DOTs) and other agencies, on estimating transportation project preconstruction services costs. The guidebook is meant to be suitable for formal balloting and acceptance by the American Association of State Highway and Transportation Officials (AASHTO) Subcommittee on Design through the Technical Committee on Preconstruction Engineering Management and for maintenance and updating by these or other AASHTO groups.

About the research

Rumble strips are a low cost safety countermeasure used to reduce roadway/lane departure crashes. When a pavement marking is applied over the rumble pattern, it is known as a rumble stripe. The practices from state to state are not uniform and there may not be one ideal design for all applications. There are advantages and disadvantages to the different rumble designs. This synthesis will identify current practices used by states installing rumble strips and rumble stripes. The scope of this synthesis study will focus on the safety benefits, rumble design, external noise considerations, durability/maintenance issues, impacts on bicyclists, and public affairs/outreach efforts. Results will benefit government agencies, researchers, and the road-building industry in providing guidance on successful practices. This synthesis will include a literature review and a survey of state departments of transportation (DOTs) and Canadian ministries of transportation. International agencies’ experience will be reviewed as available. From the results of the survey, a minimum of three agencies will be selected and case examples of their practices will be shared. Lessons learned and gaps in information will also be covered.

Visit the Transportation Research Board’s project website.

About the research

This project summarized findings from a National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) study to develop and demonstrate the application of bio-renewable polymers for use in asphalt pavements by utilizing soybean oil through chemical synthesis. Triglyceride molecules from vegetable oils have been considered as important renewable resources, which can be used as biomonomers and be polymerized into biopolymers with properties similar to petroleum-derived monomers and polymers. In this research, non-food soybean oil was selected as a starting point to produce biopolymers. The modification effects and the effectiveness of the biopolymers were evaluated through a comprehensive asphalt binder investigation to optimize formulation of the biopolymers. Meanwhile, evaluation of the actual field performance of the biopolymer modified asphalt mixture is ongoing via the construction at the National Center for Asphalt Technology (NCAT) Test Track section.

Visit the Transportation Research Board’s project website

About the research

The objectives of this research are to (a) quantify the costs and benefits of a formal partnering process and (b) prepare a recommended AASHTO Partnering Handbook, Second Edition.

Visit the AASHTO Partnering Handbook, Second Edition project website at the Transportation Research Board for more information.