Joseph Stromberg shares news of a new series of maps on the You Are Here site (Planetizen also provided earlier coverage of the site) that shows the fastest mode of transportation to get anywhere from a given point in the selected cities.
Here's how the maps work, as explained by You Are Here: "The maps is activated by selecting a specific departure point. Once the departure point is selected, the rest of the city will be colored based on the fastest mode of transportation. The point to which it's fastest to get to by bicycle are colored yellow, by public transit: blue, by walking: green, and by driving: red."
Cities mapped in the series include Manhattan, Portland, Santa Monica, Salt Lake City, and more.