A police cars sit at a couple of points between Exit 23 and 24 on I-91. They sit there anytime of the day. I’ve seen them in the morning, rush hour evening time and also late nights. If you are travelling on I91, just slow down enough to go 65-70 mph. They’re just waiting there to get someone. Once you pass Exit 21 on I91S and exit 24 on I91N, you can start cruisin again.