Jason Bylsma lives on the stretch of Centre Street between Holy Name and Weld Street. He describes building a $60 home traffic-speed setup using a Raspberry Pi, a cheap camera, some open-source software and a bit of tape and cable ties, and then turning it on to monitor speeds on the street outside his home.
25th to 75th percentile speeds on Centre St are well above the posted speed limit of 25 mph at all hours, 7 days a week. Few drivers are ever measured travelling below the posted speed limit.
Now, this is outside the main business district, the one where pedestrians risk their lives and the city occasionally proposes traffic-calming proposals that are squashed by locals convinced hateful commie socialist bicyclists from away are out to destroy their beautiful way of life, but one might assume the speed racers are not going to want to slow down much once they hit the rotary.