If the vehicle is in our system, we contact the resident. Typically that solves it. If not, we post a tow notice telling that person to call the office immediately or we will tow in 24 hours. If it's parking in handicap, ignoring closed off parking areas (for painting, repairs, etc), or other such 'major' infractions, we will tow same day. We will tag it or call the resident and tow by 5 if not moved or the issue resolved.