Indiana Code Title 9. Motor Vehicles § 9-21-3.5-2

(1) has one (1) or more motor vehicle sensors;  and

(2) is capable of producing a photographically recorded image of a motor vehicle, including an image of the vehicle's front or rear license plate, as the vehicle proceeds through a tollgate, toll zone, or other area on a tollway, qualifying project, private toll facility, or toll road that is marked as required by the department, the authority, or an operator as a place where a person using the tollway, qualifying project, private toll facility, or toll road must pay a toll.