An encroachment upon a street or highway is a fixture, such as awall or fence, which intrudes into or invades the highway or incloses a portion of it,diminishing its width or area, but without closing it to public travel. State v. Kean, CO N.II. 122, 45 Atl. 250, 48 L. R. A. 102; State v. Pomeroy, 73 Wis. 004, 41 N. W. 720;Barton v. Campbell, 54 Ohio St. 1 17. 42 N. E. 008; Grand Rapids v. Hughes, 15 Mich.57; State v. Leaver, 02 Wis. 3S7, 22 N. W. 570.