Escort Vehicles – An escort vehicle must be a passenger car or pickup truck with at least one flashing or rotating light on top of the cab. There will be displayed on the roof of the escort vehicle, an Oversize Load sign 5 feet long by 12 inches high with 8 inch high black letters on yellow background. All flashing or rotating amber lights shall be visible for a distance of 500 feet.
The load dimensions are:
Source of information: https://www.michigan.gov/documents/MDOT_MoveOS_OW_T2_92127_7.pdfCalculate Oversize/Overweight Load Regulations and Prices Instantly with Oversize.io