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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
roadside barriers
Roadside Barriers

RDG Chapter 5

barrier types
Barrier Types
  • Roadside Barriers
  • Median Barriers
  • Bridge Railings
barrier testing nchrp 350 test level 3
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 4 66
NCHRP 350 Test Levels 4-6

TL-4 Vehicle

TL-5 Vehicle

TL-6 Vehicle

evaluation criteria
Evaluation Criteria
  • Structural adequacy of the tested feature
  • Occupant risk
  • Vehicle trajectory after impact
barrier structural adequacy
Barrier Structural Adequacy
  • Any test vehicle must be contained and redirected
  • Controlled deflection of the barrier is acceptable
occupant risk
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
more occupant risks
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