• Increase font size
  • Decrease font size
  • Print
  • RSS
  • Regional Road Repair Program - Pavement Preservation

    What is Pavement Preservation

    Pavement Preservation is the treatment of existing roadway surfaces to extend their useful life. There are several types of treatments that can be applied depending on the condition of the road and whether the intent is to preserve the existing condition as long as optimal or to improve the condition. 

    Pavement preservation options:

    Fog Seal

    Four-year pavement life extension. A light application of slow setting asphalt emulsion applied to the surface of a bituminous pavement. Fog seals are used to renew aged asphalt surfaces, seal small cracks and surface voids, or adjust the quality of binder in newly applied chip seals. 

    Chip Seal

    Seven-year pavement life extension. A surface treatment in which the pavement is sprayed with asphalt and then covered with aggregate and rolled. Chip seals are used primarily to seal the surface of a pavement with non load-associated cracks and to improve surface friction on low volume streets.

    Micro Surface

    Seven-year pavement life extension. This treatment provides a “skim coat” of a restorative asphalt to the existing pavement surface, filling minor cracks and correcting pavement defects such as rutting and raveling when applied.

    Mill and Overlay

    This process removes a defined thickness of the surface of the existing asphalt pavement, and after observed defects are corrected, the same thickness is replaced with new asphalt thereby returning the pavement to a nearly new condition. This is the second most expensive pavement treatment option. With an appropriate preservation regiment over the life of the pavement it can be expected to last 20-30 years depending on traffic, soil conditions, thickness and other variables.


    Complete design and pavement replacement of an existing roadway.  With an appropriate preservation regiment over the life of the pavement it can be expected to last 30 or more years.

    Current Roadway Repair Programs

    See the current repair and preservation program on the Roadway Maintenance page.


    Pavement Preservation Program 

    Pavement preservation and rehabilitation plans are developed upon direction and funding allocation from County Administration and the Board of Supervisors. Such programs vary annually depending on funding available. The most current plans and progress are posted as available.

    Road Repair and Pavement Preservation Interactive Map
    The map shows past, current and proposed work.  Road name and addresses can be searched for.

    Follow UsShare this page


    Ana M. Olivares, P.E.

    201 N. Stone Ave., 4th Fl.
    Tucson, AZ 85701

    (520) 724-6410

    Department Home Page
    Department News
    Department Directory
    Boards, Commissions and Committees
    Report a problem