roadside safety guardrail design - in.govdesirable place gr at 12’ from ep use nested gr if low...
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ROADSIDE SAFETY &
GUARDRAIL DESIGN
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PRESENTATION
ROADSIDE SAFETYClear Zone & Obstruction Free ZoneTreatment of Obstructions Construction CZ
GUARDRAIL DESIGNGR PlacementGR Design for 3R ProjectsGR at Large Structures
Design Exceptions Common Mistakes & OmissionsPractice Pointers
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Clear Zone Concept
Space for Vehicles Run-off-the-Road to Gain ControlAmount of Obstruction-Free Area for Vehicle RecoveryLike “Airport Runway” - Free of ObstructionsPlace Roadside Hazards Away from Pavement
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Clear Zone Applicability
New Construction & Reconstruction3R/Partial 4R on InterstatesDesirable for 3RCost Effectiveness of Corrective MeasuresClear Zone values are not absoluteCZ Outside R/W – Use R/WEngineering Judgment Provide Consistent CZLevel 2 Design Exception
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5Figure 49-2A
Clear Zone Distances
Total ADT on 2-Lane RdwysDirectional ADT on Divided Highways.Compare CZ for Aux. Lane vs MainlineShow CZ on Typicals
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6Figure 49-2C
Horizontal Curve Adjustments
CZ = K * CZtc cz
K = Fig. 49-2BCZ
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Obstruction Free Zone Concept
3R ProjectsAmount of Obstruction-Free Area next to RdwyNot the same as CZ Provide CZ, if practicalOFZ Width Varies
Des Speed, Arterial/ Collector, ADT Provide Traversable DitchesLevel 2 Design Exception
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Typical Obstructions
TreesRevetment Riprap Ditches Non-Traversable Culvert EndsNon-Traversable DitchesConcrete HeadwallsUtility poles Bodies of water, permanent water depth>2’
Non traversable castings
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1) Remove or Redesign2) Relocate Outside of CZ3) Make Breakaway to Reduce Impact Severity4) Shield with Traffic Barrier5) Delineate if other Treatments not Practical
Treatment of Obstructions
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Construction Roadside Safety
IDM 82-4.0 Traffic Control Roadside Safety Reduce Motorist’s Exposure to Potential HazardsMaximize SeparationMinimize Positive Protection Devices
Applies to all Project TypesAnalysis & Review required for each MOT Phase
Construction CZFig. 82-4B
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Construction Roadside Safety
Temporary Traffic BarrierFlare Ends Outside of Const. CZAvoid Openings in BarriersAvoid using in Tapers. Provide Shy Line OffsetCheck Horizontal SSD thru Tapers/Transitions
Plan DetailsShow CZ on Typical MOT SectionsShow CZ Design SpeedAllowable Flare & Taper RatesSummarize Quantities for each Phase
Pavement Drop-offsPrefer to Close Lane3” Max Drop-off at End of DayTemp Wedge at 1:1 next to Lane
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GR Lateral PlacementPlace as Far Away from EP as PossibleShy Line Offset - Fig 49-5F Evaluate Alternatives
Additional CostReduced Barrier length, MaintenanceAccident History
INDOT Std Revisions Under Review8’ posts Backfill Material - Cohesive soils not CAB
Pave Shldr to Face of GR if offset 2’ or lessIf GR offset > 2’, Addt’l 2’ Paved not req’d
Varies
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GR at Curb Locations
Avoid using GR behind curbs Best to use Mountable CurbOffset GR to Shy Line OffsetGR at Face of Curb
Shy Line Offset
E.P
.
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Barrier Deflection
Clearance Face of GR to Fixed ObjectBased on Dynamic Deflection of Barrier/GR INDOT Std Revisions 8’ posts & BackfillCheck for Fixed Objects and Drop-offs
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GR Need Horizontal Curves
GRAPHICAL SOLUTION REQUIREDINVESTIGATE BOTH ALTERNATIVESUSE SHORTEST LENGTH OF NEED
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GR Alternate Offset
Tapered GR Example
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Non-Recoverable Slopes
Non-Recoverable Fill Slope
No Obstructions in Non-Recoverable Slope
Point of Hazard*
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GR Design Non-Recoverable Slopes
Traversable Ditch Cross Section Preferred
Example GR Design with 3:1 Slopes
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GR Design Non Recoverable Slopes
Example GR Design with 3:1 Slopes
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GR at Large Structures
New Construction 70 MPH Des SpeedNew Alignment – Divided HwyPerpetuate CZ thru Structure
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Drainage Structures
1’ to 5’ Cross PipesUse Safety Metal ESSkew > 10 Deg Use GBES
5.5’ and Larger – End Inside CZIf Cost Effective, provide Traversable ESDesirable Place GR at 12’ from EPUse Nested GR if Low Fill
5.5’ and Larger – End Outside CZDesirable Place GR on slope away from EP Desirable Place GR at 12’ from EP
Ditch InletsE-7 and F-7 Not Within CZ Use Pipe Catch BasinOther Type with less than 4” Protrusion
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Level 2 DECZ and OFZProvide Brief RationaleAlternates Considered
Document to FileSubmit to Project ManagerDiscuss at Field Check Local Projects need LPA Sign-off
Design Exceptions
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Incorrect CZ DistanceIncorrect CZ AdjustmentCZ Not Shown on Typical SectionsObstructions within OFZ or CZObstructions not Shielded or TraversableNon-Traversable DitchesDesign Exceptions Not Documented Using less than 100’ of Nested GR
Common Mistakes & Omissions
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Perform CZ reviewPlot CZ/OFZ on Plans Provide Consistent CZDetermine if any obstructions within CZDetermine/Verify Corrective ActionDiscuss CZ/OFZ at Field ChecksDocument DeficienciesCheck MOT Plan and CZ
Practice Pointers
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ROADSIDE SAFETY &
GUARDRAIL DESIGN