Research by Professor Marta González and former postdoctoral associate Pu Wang was the topic of an article in the Feb. 17 issue of the Boston Sunday Globe Ideas section. Gonzalez’s work using cellphone data to map traffic congestion showed that canceling or delaying the trips of 1 percent of drivers from carefully selected neighborhoods in five Boston-area cities would reduce the extra travel time for all other drivers in Greater Boston by 18 percent. The article was accompanied by a graphic showing which neighborhoods serve as the source of traffic leading to the worst traffic tie-ups.