It should also be mentioned that many of the divergent cases tend to be bad ideas for safety reasons anyways (passing on the right, using your cell phone when driving, even right-turn-on-red--don't do that in pedestrian-heavy areas).
Places with divergent laws make some effort to inform visitors of the divergence--you'll sometimes see electronic noticeboards saying that using your cell phone is illegal here, and sometimes permanent ones too (e.g, on entry into Virginia on interstates, you are immediately informed that radar detectors are illegal).
Places with divergent laws make some effort to inform visitors of the divergence--you'll sometimes see electronic noticeboards saying that using your cell phone is illegal here, and sometimes permanent ones too (e.g, on entry into Virginia on interstates, you are immediately informed that radar detectors are illegal).