Few issues are more emotional, and therefore vulnerable to bad analysis, than urban crime risk. Solid research indicates that more compact and mixed development tends to increase neighborhood security. Jane Jacobs was right!
The District of Columbia is attempting to build a data-based model for the mix of public and "shared" transportation modes on its streets, but is still finding holes in the data necessary to build new policies.
To get a handle on drivers whizzing through its main road, the small town of Betterton, Maryland installed a "smart" radar speed sign. The data it collected helped the local sheriff's department improve traffic enforcement.