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| Re: Main St traffic and the new Bus Only lanes (308512) | |||
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Re: Main St traffic and the new Bus Only lanes |
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Posted by Stephen Bauman on Fri Nov 27 10:22:27 2015, in response to Re: Main St traffic and the new Bus Only lanes, posted by BrooklynBus on Wed Nov 25 14:23:18 2015. DOT for not correctly analyzing the traffic conditions or for not caring about auto congestion since they belueve [believe] slowing down traffic is always a good thing.Vehicle speed has very little effect on congestion. Congestion occurs when garbage in exceeds garbage out. One might mistakenly believe that vehicles traveling faster would result in more vehicles per hour passing a particular point. One must also account for the distance between vehicles, when calculating vehicles per hour. Today's safe practice is to keep 3 seconds between cars. This replaces the rule of 1 car length for every 10 mph that was taught, when I got my drivers license. Let's assume cars are 15 feet long. At 25 mph the 3 second distance between cars should be 111 ft vs. 166 ft for 35 mph. Add the car length and these figures become 126 and 181 feet respectively. The travel time to traverse these distances the respective speeds are 3.38 and 3.48 seconds per vehicle. The inverse with units changed become 1066 and 1034 vehicles per hour. Slowing down vehicular speeds actually results in marginally greater lane capacity. |
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