Steel Pipelines Crossing Railroads and Highways (includes Errata 1 dated November 2008, Errata 2 dated May 2010, Errata 3 dated September 2012, Errata 4 dated February 2014, and Errata 5 dated March 2014) Covers the design, installation, inspec tion, and testing required to ensure safe crossings of steel pipelines under railroads and highways. The provisions apply to the design and c onstruction of welded steel pipelines under railroads and highways. The provis ions of this practice are formulated to protect the facility crossed by the pi peline, as well as to provide adequate design for safe installation and operation. The provisions herein should be applic able to the constr uction of pipelines crossing under railroads and highways and to the adjustment of existing pipelines crossed by railroad or high way construction. This practice should not be applied retroactively. Neithe r should it apply to pipelines under contract for construction on or prior to the effective date of this edition. Neither should it be applie d to directionally drilled crossings or to pipelines installed in utility tunnels