Fully autonomous vehicles? Programmed to be safe, not to crash into me? Hey! I can ignore it. Drive or walk the street in front of it, regardless of traffic lights. Deliberately stand in front at an intersection, preventing it from moving forward. Hold a mirror in front of its video or laser sensors - that ought to confuse it. What a wonderful source for entertainment, tricks, and trouble making. Yup, autonomous vehicles.
All of these Lorries will be manned and driven in formation of up to three lorries in single file. The lead vehicle will connect to the others wirelessly and control their braking and acceleration. Human drivers will still be present to steer the following lorries in the convoy.