This week, watch harrowing video from on board a school bus south of Seattle as the bus driver suffers a heart attack behind the wheel, and two quick-thinking, middle-school students rush in to peform CPR and steer the bus to safety.

See clips from the PBS series "America Revealed," which included a segment on school busing as part of its look at the nation's transportation infrastructure. The episode "Nation on the Move" aired on April 18.

"Play2Win" at www.stnexpo.com to earn a chance to win an all-expenses-paid trip to the STN EXPO in Reno this summer. Watch the vlog for this and more!