I assume you heard the motors talking about MCOMM two weeks ago. Dublin PD and other involved agencies (OSP, FCSO, DCSO) were using the MARCS talk-group MCOMM1 to coordinate traffic control in and around the Memorial Tournament. The Dublin PD motor crew served as the quick response and scouting crew for traffic and parking during the tournament and operated on MCOMM1.
This was used only for Memorial Tournament operations and the motors are back on the Dublin system for daily ops.