It sounds like purposeful vandalism removing stop signs. College students parking and driving dangerously there need to be ticketed with USC campus or Columbia or Richland County police or all 3 being called when this is in action. They need to be told to tag cars parking where they shouldn't unless there are no signs around that says no parking. If necessary go to the town council meetings with others to bring up your complaints completely documented with videos and pictures and witnesses as evidence. Too bad you can't clock drivers speeding. Sometimes it helps to have signed petitions from home owners neighborhoods around. You have to be as proactive as you can.