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| Re: The real reason for New York City's traffic nightmare (1408750) | |||
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Re: The real reason for New York City's traffic nightmare |
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Posted by Stephen Bauman on Sun Dec 4 07:56:49 2016, in response to The real reason for New York City's traffic nightmare, posted by Dave on Sat Dec 3 18:11:30 2016. From the linked article: Still, Manhattan has become a vehicular hell where drivers suffer an average speed of 8.2 mph.What should the average speed be? 1. For computational ease, let's assume an unimpeded driving speed of 20 mph or 3 min/mile. 2. There are traffic lights every block and 20 blocks to the mile. The cycle time is 90 seconds and for computational ease let's assume it's green for 45 seconds. This means the average waiting time per traffic signal is 10.25 seconds. (Average wait time 22.5 seconds, when light is red and it's read half the time.) 3. (1 and 2) Expected traveling time is 3 minutes or 180 seconds. Expected time to wait for a traffic light during a 1 mile trips is 20 x 10.25 seconds or 225 seconds. Total elapsed time is 405 seconds. 4. Average speed is 1/(405/3600) mph = 8.9 mph. 5. So 8.2 mph means that travel speed is 92% of expected speed. 6. Shut up and stop complaining. |
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