3 ms·> No traffic? Not for long, apparently.by hn9780470248775 11y ago> No traffic? Not for long, apparently.josu 11y agoWe'll have to wear helmets while walking on the street.TeMPOraL 11y agoOr start hanging nets above roads and sidewalks to catch things dropping from the sky.SEJeff 11y agolike airplanes? Might be a bit large.