barrier design principles. principle 1: distance from roadway place guardrail as far from traveled...
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Barrier Design Principles
Principle 1: Distance from Roadway
Place Guardrail
As Far FromTraveled Way As Practical
Principle 2: 2’ Minimum Clearance
For Slope Locations
2’Measured
FromBack of Post Hinge
Point
Reduce post spacing
Principle 3:Barrier to Hazard Distance
Barrier to Hazard Distance Is
Critical Element
TT hit pier
Principle 4: Terrain Effects
•Curbs
•Slopes
CurbsNot
Recommended on High-Speed Roadways
Or
With Guardrail Unless
Adequately Stiffened
Modified curb
Slopes
• Maximum slope of 1:10 or Flatter in Front of Barriers
• Vehicle will be airborne due to slope.
• The height of the rail and correlation to the height of the bumper is critical.
• Guardrail should not be installed on a slope steeper than 1:6
Recommended Barrier Placement on Slopes
Rail away from road
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