Child Pedestrians, Self-Driving Vehicles: What’s The Safest Scenario For Crossing The Road?

Crossing a busy street safely typically is a result of a social exchange. Pedestrians look for cues—a wave, a head nod, a winking flash of the headlights, and, of course, a full vehicle stop—to know it’s safe to cross.

But those clues could be absent or different with self-driving vehicles. How will children and adults...