Diana Ionescu wrote:

The choice between driving and using other modes of transit, Noor writes, "creates an inherent paradox. If more people decide that driving is quicker, there will be more traffic, clogging streets and making trips longer. The longest trips across town, the authors found, were the ones taken when every single resident tries to reduce their commute times by driving, thus creating the most traffic." 

"The authors also discuss some ways to reduce the time it takes to get across a city and lower carbon pollution, including investing in more reliable and quick public transit, building more bike lanes and walking paths, and not separating residential areas from commerce. They also suggest reducing the number of traffic lanes in cities and building less parking to discourage people from driving or even owning a car in the first place, making city travel faster for everyone."