Whenever a public highway, other than a state highway and the tracks of a railroad, or of more than one railroad whose rights of way adjoin or are in such close proximity to each other as to be necessarily involved in one elimination project, cross each other at the same level, and it shall appear to the board of public utility commissioners that such crossing is or such crossings are dangerous to public safety or that public travel on such highway is impeded thereby, the board may order the company or companies operating the railroad or railroads, within such time as the board may fix, to alter such crossing or crossings, according to plans to be approved by the board.

Such alterations may be made:

a. By substituting a crossing or crossings not at grade by carrying the highway under or over the railroad or railroads or by reconstructing the railroad or railroads under or over the highway; or

b. By vacating, relocating or changing the lines, width, direction or location of the highway and the opening of a new highway in the place of the one vacated; or

c. Where, in the judgment of the board, the owners of public or private property will be unduly injured by the elimination of the crossings, by relocating the tracks of the railroad or railroads.