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Roadside Barriers RDG Chapter 5 Barrier Types Roadside Barriers Median Barriers Bridge Railings Barrier Testing: NCHRP 350 (Test Level 3) STRENGTH TEST 4400 lb. 62 mph 25 degrees SEVERITY TEST 1800 lb. 62 mph 20 degrees NCHRP 350 Test Levels 1-3 NCHRP 350 Test Levels 4-6

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Presentation Transcript
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Roadside Barriers

RDG Chapter 5


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Barrier Types

  • Roadside Barriers

  • Median Barriers

  • Bridge Railings


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Barrier Testing: NCHRP 350 (Test Level 3)

STRENGTH TEST

4400 lb.

62 mph

25 degrees

SEVERITY TEST

1800 lb.

62 mph

20 degrees




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NCHRP 350 Test Levels 4-6

TL-4 Vehicle

TL-5 Vehicle

TL-6 Vehicle


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Evaluation Criteria

  • Structural adequacy of the tested feature

  • Occupant risk

  • Vehicle trajectory after impact


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Barrier Structural Adequacy

  • Any test vehicle must be contained and redirected

  • Controlled deflection of the barrier is acceptable


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Occupant Risk

  • No penetration of the passenger compartment

  • Passenger compartment should not be significantly deformed

  • The 1800 lb and 4400-lb test vehicles must remain upright after collision


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More Occupant Risks...

  • Unrestrained Passenger Decelerations:

    • Under 9 m/sec (30 ft./sec) preferred

    • 12 m/sec (40 ft./sec) max

  • Occupant deceleration over a 10 millisecond period:

    • Should not exceed 15 G’s

    • 20 G’s is allowable


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