Sharraxaadda

Our neighbor has all three of his vehicles parked on the street today and as of now they are all still there. We have very limited parking as there is only parking on one side of the street. Two of these vehicles are his commercial vans. His driveway sits empty! Why is this allowed? One of his vans sits day after day not moved. Our city streets are not meant to serve as storage for vehicles. One of his vans has an expired sticker on it as well. Residents should not have to deal with this. No consideration for his neighbors and its getting worse. What is the zoning rules on commercial vehicles just left sitting in front of other peoples homes?