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Section 2: Design Guidelines

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Introduction

The design guidelines presented in this section are intended to aid in planning Highway Safety Improvement Program (HSIP) projects. Work types are assigned based on the information provided by the district during the project proposal process. Only work types programmed for the safety project will be considered “the scope.” The design guidelines reference portions of the Roadway Design Manual and establish items of work not eligible for HSIP funding. These guidelines offer sufficient flexibility while retaining safety as the essential element of all HSIP projects.

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Design Guidelines

Freeway Projects and Non-Freeway “New Location or Reconstruction” Projects. All roadway elements affected by the scope of the approved HSIP safety improvement must comply with the “ New Location and Reconstruction (4R) Design Criteria” found in the Roadway Design Manual (Chapter 3). Enhancements to features outside the scope of the HSIP project are at the district’s option and are to be funded using district funds under a separate Control-Section Job ( CSJ).

Non-Freeway “Rehabilitation or Restoration” Projects. All roadway elements affected by the scope of the approved HSIP safety improvement must comply with the “ Non-Freeway Rehabilitation (3R) Design Criteria” found in the Roadway Design Manual (Chapter 4). Enhancements to features outside the scope of the HSIP project are at the district’s option and are to be funded using district funds under a separate CSJ.

“Safety Treat Fixed Objects” Projects. Projects whose primary scope of work is “Safety Treat Fixed Objects” must comply with the “Horizontal Clearance” criteria found in the “ Non-Freeway Rehabilitation (3R) Design Criteria” found in the Roadway Design Manual (Chapter 4). The designer should provide clearance greater than that required whenever reasonably practicable.

For all projects, the geometric design must meet the applicable 4R or 3R criteria or retain the existing roadway conditions (lane widths, shoulder widths, etc.) as a minimum.

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Design Considerations

At the beginning of the HSIP project proposal process, highway designers should analyze crash data to identify the specific safety problems that might be corrected and follow the suggested design process in the Roadway Design Manual ( Chapter 4, Section 3).

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Design Exceptions or Design Waivers

When the HSIP design guidelines cannot be met, the current design exception or design waiver process established in the Roadway Design Manual ( Chapter 1, Section 2) must be followed.

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