333.04  SLOW SPEED; POSTED MINIMUM SPEEDS.
   (a)   No person shall stop or operate a vehicle at such a slow speed as to impede or block the normal and reasonable movement of traffic, except when stopping or reduced speed is necessary for safe operation or to comply with law.
   (b)   Whenever the Director of Transportation or local authorities determine on the basis of an engineering and traffic investigation that slow speeds on any part of a controlled-access highway, expressway, or freeway consistently impede the normal and reasonable movement of traffic, the Director or such local authority may declare a minimum speed limit below which no person shall operate a motor vehicle, except when necessary for safe operation or in compliance with the law.  No minimum speed limit established hereunder shall be less than 30 miles per hour, greater than 50 miles per hour, nor effective until the provisions of Ohio R.C. 4511.21 or a substantially equivalent municipal ordinance, relating to appropriate signs, have been fulfilled and local authorities have obtained the approval of the Director.
(ORC 4511.22)
   (c)   No person shall operate a motor vehicle at a speed less than forty miles per hour on the Lakeland Freeway, except when necessary for safe operation or in compliance with law.
Penalty - see Sections 307.01 and 307.02