Section 21
SEC. 21. Whenever it appears to the Board that a public highway and a railroad cross one another, or that a public highway and a street railway cross one another, or that a railroad and a street railway cross one another at the same level, and that conditions at such grade crossing make it necessary for the protection of the traveling public at such grade crossing that gates be erected or that some other reasonable provision for the protection of the traveling public at such grade crossing should be adopted, the Board may order and direct such railroad company or such street railway company, or either or both of them, to install such protective device or devices or adopt such other reasonable provision for the protection of the traveling public at such crossing as in the discretion of the Board shall be necessary.