[mikester]

Politically this can't possibly be enforced at any more than the local level.

I can see some place like Santa Monica or Venice enforcing this law.

The fact is that it's not a bad law at all - just look at the condition of our roads and the repairs they require. I know near my house the roads that qualify as truck routes (namely Imperial Highway) are in terrible disrepair and I am loath to travel on them. If you take the 6k tax break then it's a commercial vehicle then it shouldn't be on a residential road any more than a fedex truck or UPS truck should be (limited to the time it takes to do the delivery).