Roadside Barriers RDG Chapter 5 Barrier Types Roadside

Roadside Barriers RDG Chapter 5

Barrier Types • Roadside Barriers • Median Barriers • Bridge Railings

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

NCHRP 350 Test Levels 1 -3 Test Level Impact speed Vehicle Type TL-1 50 kph/30 mph 820 kg Car; 2000 kg Pickup (1800 lb. ) (4400 lb. ) TL-2 70 kph/45 mph 820 kg Car; 2000 kg Pickup (1800 lb. ) (4400 lb. ) TL-3 100 kph/62 mph 820 kg Car; 2000 kg Pickup (1800 lb. ) (4400 lb. )

NCHRP 350 Test Levels 4 -6 Test Level Impact Speed Vehicle Type TL-4 100 kph/62 mph 820 kg Car; 2000 kg Pickup 80 kph/50 mph 8, 000 kg Single Unit Truck (18, 000 lb. ) TL-5 100 kph/62 mph 820 kg Car; 2000 kg Pickup 80 kph/50 mph 36, 000 kg Tractor Trailer (80, 000 lb. ) TL-6 100 kph/62 mph 820 kg Car; 2000 kg Pickup 80 kph/50 mph 36, 000 kg Tanker Truck (80, 000 lb. )

NCHRP 350 Test Levels 4 -6 TL-4 Vehicle TL-5 Vehicle TL-6 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 G’s – 20 G’s is allowable