Geometric Design Practices for Resurfacing, Restoration, and Rehabilitation: A Synthe

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Geometric Design Practices for Resurfacing, Restoration, and Rehabilitation: A Synthesis of Highway Practice

Size: 6.6 MB | Format: PDF | Publisher: TRB. FHWA | Year: 2011 | pages: 113 | ISBN: 9780309143332

The Resurfacing, Restoration, and Rehabilitation (3R) program began in 1976 when the U.S. Congress authorized funding for highway projects that were intended to extend the service life of an existing road. The program originally defined the 3Rs as follows:
1. Resurfacing—Work to place additional layers of surfacing on highway pavement, shoulders, and bridge decks, and necessary incidental work to extend the structural integrity of these features for a substantial time period.
2. Restoration—Work to return the pavement, shoulders, and bridges over a significant length of highway to an acceptable condition to ensure safety of operations for a substantial time period.
3. Rehabilitation—Work to remove and replace a major structural element of the highway
to an acceptable condition to extend the service life of a significant segment for a substantial period of years commensurate with the cost to construct.
Over time, the desire and the requirement to make safety improvements to existing facilities
in need of pavement repair changed the objective of 3R projects to include “enhance safety.” Subsequently, the issue became one of how much an existing roadway should be improved to achieve the safety objective. Should roads requiring pavement repair or other maintenance activities to extend their service life be brought up to full standards for geometric
design or other design features? Doing so would minimize the amount of mileage that could be improved under the limited funding of the 3R program.

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