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Lewis-Mogridge Position

54 点作者 danielam将近 6 年前

8 条评论

tbrownaw将近 6 年前
I think this is approximately the same as saying that transportation is the limiting factor in city growth?
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tschwimmer将近 6 年前
Intuitively there feels like there should be an upper bound on this axiom. For example, imagine a highway 1 mile wide with 50 lanes going each way. That&#x27;s 220 lanes in each direction. Assume dense traffic with each car taking up 25 of lengthwise- space. A 1 mile stretch of this megahighway would have ~60,000 cars on it. At this density, the 101 between SF and San Jose would be able to accommodate ~2.8 million cars. A quick search reveals that there are only ~2.5 million cars registered in the counties this highway would run through.<p>So while I don&#x27;t doubt that this relationship (&#x27;traffic increases to fill the available road space&#x27;) is true for some conditions, it&#x27;s not a universal law. The real question is finding out where it starts to break down. Maybe there is some merit to building a super wide highway ;)
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soVeryTired将近 6 年前
There&#x27;s disturbingly little empirical data there for what should be a very empirical question.
mrfredward将近 6 年前
&gt;traffic expands to meet the available road space<p>I&#x27;m sure this is in many cases true, but there is a danger in mistaking the metrics for the goals here. If people drive less, it makes the numbers look better, but people staying at home saying &quot;it&#x27;s impossible to get anywhere this time of day&quot; is hardly the mark of an effective transportation system.
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hhs将近 6 年前
If interested, there was a similar conversation recently about the Downs-Thomson paradox, noting the relationship between road network improvements and traffic congestion. It&#x27;s here: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=20133027" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=20133027</a>.
cr0sh将近 6 年前
Didn&#x27;t Seattle (or some other major PNW city&#x2F;area) actually remove or close roads in their area, and saw that congestion decreased overall? I seem to recall reading about that several years ago...<p>EDIT: fixed PSNW -&gt; PNW
Merrill将近 6 年前
This probably depends on:<p>- fuel being cheap,<p>- time spent driving having a low value,<p>- zoning that discourages high-density development, and<p>- overhead costs of buying and selling homes high enough to discourage moving nearer to work.
sarcasmic将近 6 年前
Sometimes it really shows that many early Wikipedia articles were someone&#x27;s labor-of-love about a relatively obscure topic, and even today there&#x27;s uneven levels of notability across the encyclopedia.<p>Instead of these hyphenated iron laws of transportation demand that no one has ever heard of that all say the same thing, the article of &quot;induced demand&quot; ought to suffice, and these formulations, if they exist original sources at all, ought to become references in that article&#x27;s footnotes.
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