[altairprime]

Incorrect. Broadly-defined laws that do not hammer out the specifics to the inch are absolutely enforceable, just not with perfect certainty ahead of time. All laws are imprecise, and judges and juries are well able to operate more flexibly than a rigid programming-style logical interpretation (IF position X WITHIN bounds Y-Z THEN arrest) would allow.

[cercatrova]

Yes. In my experience, technical people often assume that laws and judges act like programming commands, when in reality it's more like a case-by-case assessment from the point of view of a reasonable person. Judges are not stupid, they understand what "fair distance" would mean.