[MetroMPG]

I once talked to the city engineer about them, and "driver education/ability" was the main reason they've been avoiding them. A high proportion of drivers here are seniors.

Also, the city was once sued (and settled) when a motorist essentially did what's in Tony's pictures - smashed into a "traffic calming" structure (street narrowing using concrete berms & reflective signs).

So, locally I think we've got a situation of once bitten twice shy.