Ohio Rev. Code § 4955.51: Wayside detector system installation distance.

Except as otherwise provided in sections 4955.55 and 4955.57 of the Revised Code, any person responsible for the installation of wayside detector systems alongside or on a railroad shall ensure that each system location is the following distance from the adjacent system location:

(A) For a class I carrier railroad, not more than ten miles;

(B) For a class II carrier railroad, not more than twenty-five miles;

(C) For a class III carrier railroad, not more than thirty-five miles.