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Bumper Trajectories During High-Speed
Impacts with 6-in. Curbs
Ronald K. Faller, Ph.D., P.E.
Midwest Roadside Safety Facility (MwRSF)University of Nebraska-Lincoln
TRB Committee AFB 20June 15-18, 2008Jackson, Wyoming
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Introduction
• MGS placed 6 in. (mid-face) behind 6-in. high, AASHTO Type B curb met TL-3 of NCHRP 350
• Pooled Fund States sponsored study to determine performance limits of MGS behind 6-in. curbs allow for some variability in MGS placement allow for sidewalk placement in front of MGS reduce snow plow impacts with rail & resulting damage determine lateral offset when MGS needs to be raised
• Obtain bumper trajectories for curb impacts with pickup trucks and small cars
• Evaluate critical MGS offsets using MASH 082
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MGS w/ 6-In. Curb (Test NPG-5)
3
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Bumper Trajectory Test Set-up
4
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Vehicle-Curb Test - MGSC-1 (2270P)
5
4,966 lbs62.2 mph25 deg
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Vehicle-Curb Test - MGSC-2 (2270P)
6
4,966 lbs62.6 mph25 deg
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Vehicle-Curb Test - MGSC-3 (1100C)
7
2,544 lbs61.6 mph25 deg
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Wheel Damage - MGSC-3 (1100C)
8
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Vehicle-Curb Test - MGSC-4 (2000P)
9
4,479 lbs62.5 mph25 deg
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Curb-Lateral Coordinate System
10
Vehicle
Curb
Curb-Lateral Direction
Longitudinal Vehicle Path
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Critical Override Impact Point
11
Critical Point
Critical Point
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Predicted Safe Zones – 31” MGS
14
Bars Represent Safe Zones
2000P (MGSC-4)
1100C (MGSC-3)
2270P (MGSC-2)
2270P (MGSC-1)
Processed Curb-Lateral Distance (ft)
50 10 15 20 25
Unclear
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Predicted Safe Zones – 37” MGS
15
0
2270P (MGSC-1)
2270P (MGSC-2)
1100C (MGSC-3)
2000P (MGSC-4)
Bars Represent Safe Zones
Processed Curb-Lateral Distance (ft)
252015105
UnclearUnclear