Ohio DOT
The Motor Carrier Enforcement Division of the Dept. of Public Safety operates on the main OSP Talkgroup for whatever county they are working in at the time.
For those of you who listen to OSP on MARCS, their radio numbers are the 3200 series. Over here in Dayton, the main ones that work this area are: 3247, 3255, 3264, but there are six or seven others. They mainly stick to the OSP District they are in, and are frequently heard asking to be switched over to another post's CAD, as they change counties.
Motor Carrier Enforcement officers do not require any probable cause whatsoever to effect a traffic stop on a commercial motor vehicle. They focus on more than overweight vehicles, but do stop Dump Trucks and Steel Haulers quite frequently, as they are often over gross and over axle weights. They also do Level I, II, and III inspections, which involve driver only, vehicle only or driver and vehicle inspections. Licenses, logbooks, paperwork and condition of vehicle are the main focus of their stops.
One member referred to Miller Lane as a frequent stop area for DOT. The member is correct, however OSP 474, who is a trooper is the main user of the lot. He works District 5 and does weight checks exclusively. He has the scale van with him when he works. 474 is very active and can be heard on 12, 55, 57, 57/68, and 80's talkgroups.
For those that dont do MARCS yet, you can still hear the DOT when they are around, as they still use Mobile Extenders on the old UHF Frequencies of the OSP.