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Kelly Em's avatar

Two other important aspects of “Zero Vision” are economic and environmental. I brushed off my math education and performed a “Fermi calculation”, a kind of math designed to get one near to an answer that is useful but not precise. The question? What is the annual economic cost of the program? Assuming the average distance traveled is 1/3 of the length of the city, I was able to calculate that each five mile per hour decrease in travel speed might cost the city a BILLION dollars in productivity a year, because travel times on average would increase 20%. Further, each vehicle is operating for 20% longer. resulting in a 20% increase in vehicle emissions. Moreso, there are public health consequences for some people with higher emissions. Lastly, the best speed for economy for most vehicles is about 32 miles per hour. Above that, parasitic air drag begins to manifest. But most of the speed limits are below that.

I for one am sick of PBOT experimenting on me and my car. SE Division, once an important thoroughfare, is now a place to be avoided. The city could have just installed more lights and limited some left and right turns. PBOT is more properly called the Department of Traffic Jams.

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Javier's avatar

Jeff,

Did you know Millicent Williams is a convicted felon? No joke.

https://www.oregonlive.com/commuting/2016/12/portland_transportation_bureau.html

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