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Roadside Barriers

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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Roadside Barriers

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  1. Roadside Barriers RDG Chapter 5

  2. Barrier Types • Roadside Barriers • Median Barriers • Bridge Railings

  3. Barrier Testing: NCHRP 350 (Test Level 3) STRENGTH TEST 4400 lb. 62 mph 25 degrees SEVERITY TEST 1800 lb. 62 mph 20 degrees

  4. NCHRP 350 Test Levels 1-3

  5. NCHRP 350 Test Levels 4-6

  6. NCHRP 350 Test Levels 4-6 TL-4 Vehicle TL-5 Vehicle TL-6 Vehicle

  7. Evaluation Criteria • Structural adequacy of the tested feature • Occupant risk • Vehicle trajectory after impact

  8. Barrier Structural Adequacy • Any test vehicle must be contained and redirected • Controlled deflection of the barrier is acceptable

  9. 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

  10. 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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