Roadside Barriers RDG Chapter 5. Barrier Types Roadside Barriers Median Barriers Bridge Railings.
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Transcript of Roadside Barriers RDG Chapter 5. Barrier Types Roadside Barriers Median Barriers Bridge Railings.
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 Level Impact speed Vehicle Type
TL-1 50 kph/30 mph 820kg Car; 2000kg Pickup
(1800 lb.) (4400 lb.)
TL-2 70 kph/45 mph 820kg Car; 2000kg Pickup
(1800 lb.) (4400 lb.)
TL-3 100 kph/62 mph
820kg Car; 2000kg Pickup
(1800 lb.) (4400 lb.)
NCHRP 350 Test Levels 4-6
Test Level Impact Speed Vehicle Type
TL-4 100 kph/62 mph
80 kph/50 mph
820kg Car; 2000kg Pickup
8,000kg Single Unit Truck
(18,000 lb.)
TL-5 100 kph/62 mph
80 kph/50 mph
820kg Car; 2000kg Pickup
36,000kg Tractor Trailer
(80,000 lb.)
TL-6 100 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 G’s– 20 G’s is allowable