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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 Test LevelImpact speed Vehicle Type TL-150 kph/30 mph 820kg Car; 2000kg Pickup (1800 lb.) (4400 lb.) TL-270 kph/45 mph 820kg Car; 2000kg Pickup (1800 lb.) (4400 lb.) TL kph/62 mph820kg Car; 2000kg Pickup (1800 lb.) (4400 lb.)
NCHRP 350 Test Levels 4-6 Test LevelImpact Speed Vehicle Type TL kph/62 mph 80 kph/50 mph 820kg Car; 2000kg Pickup 8,000kg Single Unit Truck (18,000 lb.) TL kph/62 mph 80 kph/50 mph 820kg Car; 2000kg Pickup 36,000kg Tractor Trailer (80,000 lb.) TL kph/62 mph 80 kph/50 mph 820kg Car; 2000kg Pickup 36,000kg Tanker Truck (80,000 lb.)
NCHRP 350 Test Levels 4-6 TL-5 Vehicle TL-6 Vehicle TL-4 Vehicle
Evaluation Criteria Structural adequacy of the tested feature Occupant risk Vehicle trajectory after impact
Barrier Structural Adequacy Any test vehicle must be contained and redirected Controlled deflection of the barrier is acceptable
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... 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 Gs –20 Gs is allowable
1 1 = = = 18 9 = 30 5 = = 36 9 =
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1 1 = = = = = 6.
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