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Research Portfolio | Ongoing Research | Innovation Life Cycle | Roadmaps | Deployment Priority, Market-Ready Technologies and InnovationsConstruction Analysis for Pavement Rehabilitation Strategies (CA4PRS)NEW Problem: State transportation agencies are increasingly shifting their focus from constructing new highways to rehabilitating and reconstructing existing facilities
We need to be able to build highways that are safer, longer lasting, and faster at a lower cost.
Furthermore, Highway rehabilitation projects often cause congestion, safety problems, and road accessibility issues. With this in mind, agencies face a challenge in finding economical ways to rehabilitate deteriorating roadways in metropolitan areas while also keeping the traveling public as safe as possible and minimizing disruptions for local communities and surrounding businesses.
Solution: The CA4PRS software identifies optimal rehabilitation strategies that balance the construction schedule with inconvenience to drivers and transportation agency costs
The CA4PRS software was developed by the Institute of Transportation Studies at the University of California (UC) Berkeley under a Federal Highway Administration (FHWA) pooled-fund study in 2002. In 2006, the CA4PRS software was selected as a priority technology by American Association of State Highway and Transportation Officials' (AASHTO) Technology Implementation Group (TIG). In support of nationwide deployment, FHWA recently initiated changes through the pooled-fund project to allow for licensing of the CA4PRS software by State transportation departments and to fund associated training and outreach on the use of CA4PRS and other construction analysis software tools (CAST). With these changes, all State highway agencies may now have unlimited access to the CA4PRS software and associated technical support at their request and at no cost. Basic training in the use of the software will also be available to states at no cost for a limited period of time on a first come first serve basis.
CA4PRS identifies optimal rehabilitation strategies that balance the construction schedule with inconvenience to drivers and transportation agency costs. The program considers the "what if" scenarios for such variables as rehabilitation strategy; construction window (i.e., nighttime, weekend, or continuous closures); number of lanes to be closed for rehabilitation; material selection; pavement base type; and contractor logistics, including access to the site and production rates. The CA4PRS results can also be integrated with traffic simulation tools to estimate road user delay costs arising from construction. The software aids in establishing schedules, developing staging construction plans, estimating cost (A) + schedule (B) contracts, and calculating incentive and disincentive specifications for contracts.
Successful Applications: Confirming the effectiveness of the CA4PRS software through rehabilitation and reconstruction projects
CA4PRS was used with traffic simulation models to select the most economical rehabilitation scenario for the I-15 Devore Project. The 4.5-km concrete reconstruction project, which would have taken 10 months using traditional nighttime closures, was completed over two 9-day periods using one-roadbed continuous closures and around-the-clock construction. Implementing continuous closures rather than repeated nighttime closures in this project resulted in significant savings. Alternative strategies enabled by use of CA4PRS led to an accelerated project process dubbed "Rapid Rehab" that was praised by professionals.
Other sponsoring State Transportation Departments have also used CA4PRS for analyses of corridor rehabilitations. The Washington State DOT used it to analyze reconstruction of Interstate 5 through Seattle, and the Minnesota DOT used it to analyze the rehabilitation of interstates 394 and 494 in St. Paul. National Deployment Goal National Deployment Status Four states have used the CA4PRS software on a trial basis on construction projects. Eleven additional states have expressed interest in the software since it was made available through the pooled fund. Seven States have confirmed schedules for the one-day training sessions for the spring – summer 2009. Four other training sessions are tentatively planned for fall 2009.   Presentations about CA4PRS and other CAST tools are scheduled for six conferences in 2009 (Transportation Construction Management Conference in February 2009, LCCA Forum and FHWA-CPTP Conference in April 2009: AASHTO Traffic Subcommittee in June 2009, AASHTO Design Subcommittee in August 2009, Value Engineering National Conference in August, and AASHTO Construction Subcommittee in August 2009.) Phase of Deployment PHASE III-Delivery Activities
Additional Resources To learn more about AASHTO-Technology Implementation Group's approved technologies, visit http://tig.transportation.org.
For more information about CA4PRS, contact:
James Sorenson
To request additional copies of this publication, contact:
TaMara McCrae
This page last modified on 02/06/09
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