Such a capital improvement is defined as a 3R project (resurfacing, restoration, and rehabilitation), partial-reconstruction (4R) project, or full-reconstruction (4R) project. This Chapter discusses the Department’s design criteria for a 3R or partial 4R reconstruction project on a …

98 3R Project Design Guidelines for Specific Roadway Types This chapter presents design guidelines for 3R projects. The design guidelines are based on explicit consideration of estimates of the crash reduction effectiveness of design improvements, where available, and on the use of beforeâ after benefitâ cost analysis tools.

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improvements. Where the 3R project scope of work is selected, costly work (e.g., bridge reconstruction or replacement, alignment improvements), which has a long service life and can be incorporated into a future 4R project, should desirably be constructed to satisfy 4R design criteria as part of the 3R project.

3R Design（株式会社スリーアールデザイン）は、全国の産業廃棄物・処理困難物の処理、有価物(スクラップ)を中心に事業を展開しております。

Each of these sets of 3R design criteria have been proposed by the highway agency and approved by FHWA, and each is followed by the agency in designing 3R projects unless a design exception is requested and obtained.

Jul 24, 2017 · Rehabilitation (3R); Preventive Maintenance; and Design Exceptions/Design Variances. The National Association of City Transportation Officials (NACTO) also provides helpful recommendations.

3.09 NON-FREEWAY RESURFACING, RESTORATION, AND REHABILITATION (3R) MINIMUM DESIGN GUIDELINES.

Dec 12, 2024 · Rehabilitation Projects (3R) (Published 2021) •Presents a rational approach for estimating the cost-effectiveness of including safety and operational improvements in a 3R project •Intended to replace TRB Report 214 •PBPD approach provides the basis for determining design improvements that should be incorporated into 3R projects

This chapter discusses the definition of 3R projects and how they differ from new construction and reconstruction projects; the objectives of 3R projects; and typical improvements considered in 3R projects in addition to resurfacing. 2.1 New Construction Versus Reconstruction Versus 3R Projects Understanding of the context for design of 3R ...