Office Of State Aid Road Construction (OSARC) ROADWAY .

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Office of State Aid Road Construction(OSARC)ROADWAY DESIGNMANUALOFFICE OF STATE AID ROAD CONSTRUCTIONP.O. Box 1850Jackson, MS 39216Harry Lee James, PEState Aid EngineerFebruary 1, 2021

OSARCRoadway Design ManualRevised 2-1-21Table of Contents1.1GENERAL . 41.1.1 Project Oversight . 41.1.2 Legislative Background. 41.1.3 Office of State Aid Road Construction Responsibilities . 51.1.4 County Responsibilities . 51.1.5 Sources of Information . 61.1.5.11.1.5.21.1.5.3Design Guides . 6Standard Specifications and Drawings . 6Technical Assistance. 63.1.4.13.1.4.23.1.4.33.1.4.43.1.4.5Curve Types . 8Traveled Way Widening . 8Superelevation Rate and Minimum Radii . 8Superelevation Transition Length . 8Superelevation Axis of Rotation . 83.1.5.13.1.5.23.1.5.3Maximum Grades. 9Minimum Grades . 9Minimum Length of Vertical Curve . 3.1.6.83.1.6.9Lane Widths . 11Shoulder Width and Type . 11Right-of-Way Width. 11Bridges . 11Roadside Clear Zone . 12Vertical Clearances. 12Surface and Shoulder Cross Slopes . 12Pavement Skid Resistance. 12Side Slopes . 73.1.7.83.1.7.9General Design Controls. 13Turning Radii Design . 13Turning Roadways . 13Auxiliary Lanes . 13Roundabouts . 14Intersection Sight Distance . 14Channelization . 14Driveway Design . 14Intersection Near Railroad Crossings . 143.2.3.1General . 292.1BASIC DESIGN CONTROLS . 62.1.1 Highway Systems and Funding . 62.1.2 Project Scope of Work . 73.1GEOMETRIC DESIGN CRITERIA (NEW CONSTRUCTION/RECONSTRUCTION) . 73.1.1 Design Traffic Volumes. 73.1.2 Design Speed . 73.1.3 Stopping and Passing Sight Distance . 83.1.4 Horizontal Alignment . 83.1.5Vertical Alignment. 93.1.6Cross-Section Elements . 93.1.7At-Grade Intersections . 133.1.8 Traffic Control Devices . 143.1.9 Environmental Quality . 143.1.10Roadside Safety . 153.1.11Geometric Design Criteria. 153.1.12Exceptions to Geometric Design Criteria . 163.2GEOMETRIC DESIGN: RESURFACING, RESTORATION AND REHABILITATION-3R . 253.2.1 3R Project Evaluation . 253.2.2 Design Controls . 253.2.3 Cross-Section Elements . 29Page 2 of 37

OSARCRoadway Design ManualRevised 2-1-213.2.3.23.2.3.33.2.3.4Bridge Scope of Work . 29Bridge Width . 29Bridge Rails/Transitions . 303.3.3.13.3.3.23.3.3.3Traffic Counts . 33Analysis of Traffic. 33Analysis of Subgrade Material . 333.2.4 Horizontal Alignment . 303.2.5 Vertical Alignment. 313.2.6 At-Grade Intersections . 313.2.7 Roadside Safety . 313.2.8 Exceptions to Geometric Design Criteria . 323.3PAVEMENT DESIGN . 323.3.1 General Criteria. 323.3.2 Design Requirements . 323.3.3 Design Procedure . 333.3.4Design of Pavement Structures . 34Page 3 of 37

OSARCRoadway Design ManualRevised 2-1-21GEOMETRIC DESIGN OF STATE AID PROJECTS1.11.1.1GENERALProject OversightThe Office of State Aid Road Construction (State Aid) is responsible for oversight of the State AidProgram (SAP), Local System Bridge Replacement and Rehabilitation Program (LSBP), and the LocalSystem Road Program (LSRP) for the benefit of the several county Boards of Supervisors. State Aid alsoadministers programs or projects by agreement with the Boards that include Federal Highway (FHWA),Mississippi Development Authority (MDA), or other sources. County governments enter formalagreements with State Aid and have certain responsibilities to be eligible to have state funds expendedfor county road and bridge construction. Additional information is available in the State Aid StandardOperating Procedures.This document provides the geometric design criteria for projects administered by State Aid. The desi