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600 Roadside Design

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600 Roadside Design 600 Roadside Design 600.1 Introduction..........................................................................................................................1 600.2 Clear Zone.............................................................................................................................1 600.2.1 Parallel Embankment Slopes & Ditches ................................................................................................... 2 600.2.2 Urban Lateral Offsets ............................................................................................................................... 2 600.2.3 Operational Offsets on Urban Streets...................................................................................................... 3 601 Warrants .................................................................................................................................. 3 601.1 Roadside Barrier Warrants ....................................................................................................3 601.1.1 Obstacles .................................................................................................................................................. 4 601.1.2 Slopes ....................................................................................................................................................... 4 601.1.3 Protection of Others ................................................................................................................................. 4 601.1.4 Protection on Low Speed Roadways ........................................................................................................ 4 601.1.5 Protection on Low-Volume Collectors and Local Roads (ADT ≤ 2000) .................................................... 5 601.1.6 Preservation of Safety Grading ................................................................................................................ 5 601.2 Median Barrier Warrants.......................................................................................................5 601.2.1 Safety Studies ........................................................................................................................................... 5 601.3 NHS Criteria ..........................................................................................................................6 601.4 Design Considerations for Large Trucks ..................................................................................6 602 Site Considerations .................................................................................................................. 7 602.1 Roadside Protection ..............................................................................................................7 602.1.1 Location/Offset......................................................................................................................................... 7 602.1.2 Length of Need on Tangent Alignments................................................................................................... 7 602.1.3 Length of Need on Curved Alignments .................................................................................................... 8 602.1.4 Grading for Barriers & End Treatments ................................................................................................... 8 602.1.5 Guardrail with Curbs ................................................................................................................................ 9 602.1.5.1 On High Speed Roadways ................................................................................................................. 9 602.1.5.2 On Low Speed Roadways .................................................................................................................. 9 602.1.5.3 End Treatments and Impact Attenuators in Curbed Sections ........................................................ 10 602.2 Median Protection .............................................................................................................. 10 602.2.1 Shielding of Fixed Objects in the Median............................................................................................... 10 602.2.1.1 Narrow Median Barrier Installations .............................................................................................. 10 602.2.1.2 Wide Median Barrier Installations .................................................................................................. 10 602.2.1.3 Greatest Offset Method to Shield Center Median Piers ................................................................ 10 602.2.2 Mitigation of Cross Median Crashes (CMC) ........................................................................................... 10 602.2.2.1 Barrier Selection.............................................................................................................................. 10 602.2.2.2 Cable Barrier Placement in the Median.......................................................................................... 11 602.2.2.3 Cable Anchors ................................................................................................................................. 11 602.2.2.4 Cable Barrier as the Primary Barrier System .................................................................................. 11 602.3 Gore Area Protection .......................................................................................................... 11 602.4 Protection at Drives and Side Roads .................................................................................... 11 602.5 Protection at Bridges and Fixed Objects ............................................................................... 12 602.5.1 Guardrail at Bridges & Large Culverts .................................................................................................... 12 602.6 Protection at Drainage Structures ........................................................................................ 12 July 2021 Location and Design Volume 1 600 Roadside Design 602.6.1 Transverse Drainage ............................................................................................................................... 12 602.6.2 Intersecting Embankments & Parallel Drainage .................................................................................... 13 602.6.3 Special End Treatments .......................................................................................................................... 14 602.7 Sight Distance Considerations.............................................................................................. 14 603 Roadside Safety Devices........................................................................................................ 14 603.1 Longitudinal Barriers ........................................................................................................... 14 603.1.1 Flexible Cable Systems ........................................................................................................................... 14 603.1.1.1 Generic Low Tension Cable ............................................................................................................. 14 603.1.1.2 Proprietary High Tension Cable Systems ........................................................................................ 14 603.1.2 Semi Rigid Barriers ................................................................................................................................. 15 603.1.2.1 Type MGS Guardrail ........................................................................................................................ 15 603.1.2.3 Barrier Design Guardrail ................................................................................................................. 16 603.1.2.5 Long Span Guardrail ........................................................................................................................ 16 603.1.4 Rigid Concrete Barrier ............................................................................................................................ 16 603.1.4.1 Single Slope Barrier ......................................................................................................................... 16 603.1.4.2 Types B & B1 ................................................................................................................................... 17 603.1.4.3 Type C & C1 ..................................................................................................................................... 17 603.1.4.4 Type D ............................................................................................................................................. 17 603.1.4.5 New Jersey Shape ........................................................................................................................... 17 603.1.4.6 Portable Concrete Barrier ............................................................................................................... 17 603.1.4.7 Zone of Influence ............................................................................................................................ 18 603.2 Characteristics of Anchor Assemblies & Impact Attenuators ................................................. 18 603.2.1 Energy Absorbing 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