4. Chicago

Chicago

Chicago is ahead of the curve in its effort to use sensors to track traffic conditions. Chicago's Array of Things project posts sensors above many of the city's intersections to track air quality and traffic conditions on a block-by-block level.

The project is an early example of how cities will leverage data to better serve citizens.

Read more: Chicago gets serious about tracking air quality and traffic data

Meanwhile, on Interstate 75 outside Detroit, Michigan's state government is testing smart signs and road sensors that communicate with autonomous vehicles. In Central Ohio, the government is investing $15 million to bring similar smart technology to roads.

First published August 29, 2017: 3:00 PM ET