My previous columns about how Inverness confronted its perennial problem of speeders zooming through the village center got us as far as late 2003. That’s when the county’s highway engineers released data from traffic surveys conducted before and after a test median defined by temporary asphalt curbs was installed on Sir Francis Drake Boulevard.

The rejoicing was palpable when we learned that the midday average speed had plummeted from 34 m.p.h. in December 2002 to…