This unique book gives approved standards for all types of public works construction - from the depth of paving on roads to the adhesive used on pavement markers. The "Greenbook" standardizes public works plans and specs to provide guidelines for both cities and contractors so they can agree on construction practices used in public works and has been adopted by over 200 cities, counties, and agencies throughout the U.S. This 2012 Edition is the 16th edition, which is updated and republished every three years. In each of the two years between publication of a new Greenbook edition, the changes which have been researched and approved by the committee during the preceding year, are published in pamphlet form as amendments to the current edition. This program maintains a "living" document in public works specifications. Stripes in the margin of each new edition point out significant changes in the text adopted since the preceding edition.