Chapter 4: Non-Freeway Rehabilitation (3R) Design Criteria


Section 1: Purpose

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Rehabilitation (3R) projects consist of non-freeway transportation projects that extend the service life and enhance the safety of a roadway. In addition to resurfacing and restoration, the activities may include upgrading the geometric design and safety of the facility. Work on 3R projects does not include the addition of through travel lanes (i.e. no added capacity). 3R projects may include upgrading geometric features such as roadway widening, minor horizontal realignment, and bridge improvements to meet current standards for structural loading and accommodate the approach roadway width. See alignment discussion in Chapter 4 Section 2, Design Characteristics for additional clarification on horizontal and vertical alignment.

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Design Guidelines

Design guidelines for 3R projects have been developed to allow greater design flexibility. At the District’s option, design values above those presented in this chapter may be used.

These guidelines offer sufficient flexibility to ensure cost effective design and further compliance with the program goals of preserving and extending the service life and enhancing safety. While highway safety may not be the primary reason for initiating a 3R project, it is an essential element of all projects. 3R projects should identify and incorporate appropriate safety enhancements.

For 3R projects, current average daily traffic (ADT) volumes of less than 1,500 are defined as low traffic volume roadways.

3R Projects must be assessed to determine if bicycle accommodations are required per Chapter 6, Section 4 (Bicycle Facilities); if bicycle facilities are provided, they must meet the additional requirements specified in Chapter 6, Section 4.

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