(1) "Active traffic control devices" means those traffic control devices located at or in advance of grade crossings, activated by the approach or presence of a train, such as flashing light signals, automatic gates and similar devices, manually operated devices, and a crossing watchperson, all of which display to operators of approaching vehicles positive warning of the approach or presence of a train.

    (2) "Alcoholic liquor" means that term as defined in section 105 of the Michigan liquor control code, 1998 PA 58, MCL 436.1105.

    (3) "Bridge" means a structure including supports erected over a depression or an obstruction, such as water, a highway, or a railway, having a track or passageway for carrying traffic or other moving loads, and having an opening measured along the center of the roadway of more than 20 feet between undercopings of abutments or spring lines of arches, or extreme ends of openings for multiple boxes where the clear distance between openings is less than half of the smaller contiguous opening.

    (4) "Bridge carrying railroad traffic" means any bridge carrying a railroad track on which locomotives, railroad cars, or railroad maintenance machinery may be operated or moved. Bridge carrying railroad traffic includes unloading pits, turntables, and ferry aprons which meet the physical criteria for the definition of a bridge.

    (5) "Department" means the Michigan department of transportation.

    (6) "Diagnostic study team" means a group of knowledgeable individuals from the department, road authorities, railroads, and others who meet and, using crossing safety management principles, evaluate conditions at proposed or existing crossings and assist the department in making determinations concerning safety needs.

    (7) "Flagger" means a person, other than a railroad employee, clearly visible to approaching traffic at all times, who controls highway traffic through work areas using a hand-held paddle sign during daylight hours and approved lights and reflectorized paddle signs at night.

    (8) "Grade crossing" means the point at which any railroad intersects with any public street or highway, or a nonmotorized trail.

    (9) "Grade separation" means an intersection of a railroad and a highway at different levels with either the railroad above or below the highway.