Barrier Design Principles. Principle 1: Distance from Roadway Place Guardrail As Far From Traveled Way As Practical.

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Presentation transcript:

Barrier Design Principles

Principle 1: Distance from Roadway Place Guardrail As Far From Traveled Way As Practical

Principle 2: 2 Minimum Clearance For Slope Locations 2 Measured From Back 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

Curbs Not 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