Witnessed was ISP District 5 but as a statewide agency these trends to spread quickly. Approached, identified visually as a pack was clearing...passed him as a few one cars came by then the lead of the next pack got blasted (all opposing traffic)
GF was driving so no video but I did get photo....
(District 5 car 69)
Marked his spot in the median on Trapster, it was I55 NB MM221.
This is the first I've seen them be selective about their I/O use.