Statistical Map

1.    

http://mappery.com/United-States-Travel-Time-to-Work-Statistical-Map 

Statistical maps can show the average distance from one place to another as shown in this example. This map has mean travel times to work according to the National Data Book in 2006. Colors are used because states that are darker represent longer travel times.
(It has an error code embedded in the link, but if you click proceed it works perfectly fine.)