An unconventional look at American roads, mapped by their speed limits.
The above map, from MetricMaps, illustrates that abrupt division using local speed limit data. That map shows the maximum local speed limit for any local roads or highways in each Census block group in the U.S. The nationwide contrasts are striking, but so are the local ones: Zoom in to an individual city like Los Angeles, and the darker arteries effectively outline highways.
Via Seth Dixon