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Roadside Barriers RDG Chapter 5. Barrier Types Roadside Barriers Median Barriers Bridge Railings.

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Presentation on theme: "Roadside Barriers RDG Chapter 5. Barrier Types Roadside Barriers Median Barriers Bridge Railings."— Presentation transcript:

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 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.)

5 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.)

6 NCHRP 350 Test Levels 4-6 TL-5 Vehicle TL-6 Vehicle TL-4 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 Gs –20 Gs is allowable


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