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