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Just to note the numbers for the smaller jurisdictions are very sketchy, because the sample size is so tiny. I am sure biking in Rockville was not nearly that volatile. Better to aggregate several years of ACS data.

Whoa, that's a huge drop in Arlington.

Sadly, I've decided to stop bike commuting and decided to walk instead. Takes much longer but it is just too dangerous. I'd be curious to know if that's common here.

Error and uncertainty rise as you get to smaller and smaller populations and sample sizes. A well known statistical and epistemological problem. It shows in the year over year variability, especially in small jurisdictions and especially with modes that are only getting single digit percentages

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