Tom Vanderbilt:

Traffic is the most dangerous thing that most of us ever encounter.

Bruce Schneier:

The increased automobile deaths due to people deciding to drive instead of fly is 500 per year.

David Byrne:

Look around you. Bikes are everywhere: in glamorous ads and fashionable neighborhoods, parked outside art galleries, clubs, office buildings. More and more city workers arrive for work on bikes. The future is visible in the increasing number of bikes you see all over the urban landscape.

Tyler Cohen:

Manhattan streets are full of cars cruising around, looking for cheaper on-street parking, rather than pulling into a lot. The waste includes drivers' lost time and the costs of running those engines. By contrast, San Francisco has just instituted a pioneering program to connect parking meter prices to supply and demand, with prices being adjusted, over time, within a general range of 25 cents to $6 an hour.

Tom Vanderbilt:

After almost a hundred years in which driving has remained essentially unchanged, it has been completely transformed in just the past half decade.

Bradley Berman:

BMW estimates that one-pedal driving increases by 20 percent the amount of energy reclaimed when the electric drive motor switches into generator mode and pumps juice into the battery pack.

Joshua Brustein:

With Driving Safely, users enter their children's phone numbers, and the app automatically begins gathering information. A parent then sees the information from a car's dashboard, like how fast it is traveling or how much gas is in the tank. The system can be set to send alerts, so that users will be notified instantaneously if drivers they are tracking brake suddenly after sending a text, or are driving without seat belts.

The app also collects data over time to give what Mr. Dar described as a driver's "DNA score," showing how safely someone is driving. He pulled up a prototype app, showing two children from a fictional family side by side; one sibling was a slightly safer driver than the other.

Mr. Dar acknowledged that this sort of monitoring will most likely be more popular among those doing the tracking than those being tracked. So the system builds in a rewards system for drivers. If a driver maintains a certain DNA score over a period of time, for instance, his or her account would be credited with an extra allotment of text-messaging capability. Testing on the app is set to begin in June with a group of AT&T employees in Atlanta and their children.