Download - Physics of Cycling Safety
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Physics ofCycling Safety
L. Van Warren MS CS, AE
Jan 2010
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Sources of Cycling DangerCollision with Car or Truck
Collision with Cyclist or Fall
Mechanical Failure, Flat Tire, Pothole
Metabolic Failure
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Jogger Cyclist Car Truck 2 5 1,521
943,722
(Vertical feet)
Collision Kinetic Energy @ 45 mph
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Collision Kinetic Energy @ 45 mph
Jogger Cyclist Car 2 5
1,521
(Vertical feet)
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Collision Kinetic Energy @ 12 mph
Jogger Cyclist
2
5 (Vertical feet)
(Vertical feet)
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Principle Collision ConfigurationsSide-swiped from behind
Large difference in velocity.On the “reveal” in a line of cars.Rear-view mirror makes huge difference!
Head on with oncoming Car Making Left Turn
Intersections!!
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Hot Spot #1: Cross & LaHarpe
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#2: Markham & Rodney Parham
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#3: Markham & Hughes
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#4: Chenal Parkway
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ConclusionsSeparate Joggers and Cylists from Cars and Trucks
Bike paths should be widened and smoothed.
Transitions should be free of “lips”, ADA-compatible.
Educate higher energy to yield to those with less.
Pay attention to hot spots!