The department of transportation upon request from any local authority shall, or upon its own initiative may, conduct an investigation of any bridge or other elevated structure constituting a part of a highway, and if it finds that such structure cannot with safety withstand traffic traveling at the speed otherwise permissible under sections 4511.01 to 4511.85 and 4511.98 of the Revised Code, the department shall determine and declare the maximum speed of traffic which such structure can withstand, and shall cause or permit suitable signs stating such maximum speed to be erected and maintained at a distance of at least one hundred feet before each end of such structure.
Upon the trial of any person charged with a violation of this section, proof of said determination of the maximum speed by the department and the existence of said signs shall constitute prima-facie evidence of the maximum speed which can be maintained with safety to such bridge or structure.
If the offender commits the offense while distracted and the distracting activity is a contributing factor to the commission of the offense, the offender is subject to the additional fine established under section 4511.991 of the Revised Code.
R.C. § 4511.23