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Faster is Safer!
My SisterinLaw just can't understand, why I feel that going faster, on a bicycle, is safer. "30 mph!" ... "You're gonna kill your self!". ...
I feel it necessary to prove that faster is safer. Let me try a mathematical approach.
First, let me qualify;
1. My riding is in an urban area and 95% of the streetsroads are 30 mph limit.
2. I ride on the right side of the road, going "with traffic", as is the legal method.
For ease of math  Let's figure a 10 mile trip, w/traffic @ 10 cars per minute.
At 10 mph 
60min x 10cars  1/3 (for 1/3 speed of cars) = 400 cars passing you at 20mph.
At 20 mph 
30min x 10cars  2/3 (for 2/3 speed of cars) = 100 cars passing you at 10mph.
AND, cars have twice the time to notice, and avoid, you!
At 30 mph 
20min x 10cars  3/3 (for 3/3 speed of cars) = 0 cars passing you!
(Math is simplified  but "sound")
If you concede that most urban bike accidents are directly related to passing cars, then 20 mph would be (4 times safer than 10 mph) x (twice the time the, approaching, driver has to see biker) = 8 times safer @ 20 mph, compared to 10 mph!
A__hole factor! Everyone might agree that, possibly, 1 in 100 motorists are AHs toward bicyclists, (Conservative Estimate!), Going 10 mph you'll get passed by 4, only 1 @ 20 mph and at 30 mph you might never encounter 1.
EZip Engineering 101
My SisterinLaw just can't understand, why I feel that going faster, on a bicycle, is safer. "30 mph!" ... "You're gonna kill your self!". ...
I feel it necessary to prove that faster is safer. Let me try a mathematical approach.
First, let me qualify;
1. My riding is in an urban area and 95% of the streetsroads are 30 mph limit.
2. I ride on the right side of the road, going "with traffic", as is the legal method.
For ease of math  Let's figure a 10 mile trip, w/traffic @ 10 cars per minute.
At 10 mph 
60min x 10cars  1/3 (for 1/3 speed of cars) = 400 cars passing you at 20mph.
At 20 mph 
30min x 10cars  2/3 (for 2/3 speed of cars) = 100 cars passing you at 10mph.
AND, cars have twice the time to notice, and avoid, you!
At 30 mph 
20min x 10cars  3/3 (for 3/3 speed of cars) = 0 cars passing you!
(Math is simplified  but "sound")
If you concede that most urban bike accidents are directly related to passing cars, then 20 mph would be (4 times safer than 10 mph) x (twice the time the, approaching, driver has to see biker) = 8 times safer @ 20 mph, compared to 10 mph!
A__hole factor! Everyone might agree that, possibly, 1 in 100 motorists are AHs toward bicyclists, (Conservative Estimate!), Going 10 mph you'll get passed by 4, only 1 @ 20 mph and at 30 mph you might never encounter 1.
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