Why are there so many abandoned builders/construction trailers,

Avalon - Why are there so many abandoned builders/construction trailers, trucks and vans on the streets? Many are not even near new builds or remodel venues. More importantly, these vehicles should not be parked in front of year-round resident housing. How inconsiderate. Why is this allowed and who is monitoring these infractions? At a minimum, storage fees should be charged. NOT GOOD...................