The small, blue shuttle drove defensively. Slowly. Piloted entirely by computer, it followed the rules of the road like a student driver trying to impress an instructor.
It approached the traffic signal, where it was set to turn right. On the corner, a pedestrian attempted to wave it on through before realizing there was no driver to heed his directive. The stalemate — politeness verses programming — was broken only when the light turned green and the shuttle could lawfully proceed.