How do young professionals and college students move around the city? How do they use roads and transportation systems? What influences their choices? Today’s writers — a 27-year-old college English teacher and a 24-year-old Ph.d candidate at Georgia Tech — can begin to give us a clue. Both are avid bicyclists, but they infuse this old-school mobility with the latest technology and attitude. They represent a younger generation determined to inspire and help build the transportation systems they want — one by one, if necessary.

Today's columnists:

Jessica Estep: I'd rather be biking; it's safer