Delivery drones could use public transport to extend their range

Delivery drones could get further by taking the bus. By landing on public transport, the little flying vehicles could travel four-and-a-half times as far, making them more useful for carrying packages over longer distances. Drones are agile, fast and energy-efficient, but their measly battery life means they can't fly for long – considerably less than an hour for most consumer drones. That's a problem if you want to deliver packages across a large city so researchers at Stanford University devised a computer program that plans deliveries by getting drones to piggyback on public …