Pavement Preservation Program

Phoenix has a comprehensive roadway network of more than 4,850 miles of public streets.  The Street Transportation Department Street Maintenance division is responsible for the planning, programming and execution of the city’s street maintenance program.  This entails maintaining all roadways within the city’s jurisdiction limits and does not include private streets, state routes maintained by ADOT and roads maintained by Maricopa County.

Starting in early spring and continuing through the fall, the Street Maintenance Division performs annual routine street maintenance activities to keep the city’s street network in a state of good repair and extend their lifespan. The work to repair and improve our roadways ranges from pothole patching to the longer term and most expensive projects of resurfacing and the more extensive road reconstruction.

Enhancing the safety of the roadway and improving the ride comfort of the road surface provides a benefit to the traveling public.

Pavement Preservation Program Fact Sheet and Frequently Asked Questions



Program Budget<div class="ExternalClassDFAFAC1947604E72A0BE75A829CC4716"><p>The annual budget for street repair and maintenance is typically between $24 - $27 million.</p><p>Starting January 1, 2016, revenues generated over the next 35 years from the new transportation sales tax (Transportation 2050) will allow for a significant increase in resources to build and maintain the city’s street network. Nearly $1 billion from Transportation 2050 program funds will be allocated to major maintenance of the city’s arterial and major collector streets network. This will increase the annual budget to $37 – 40 million.</p><p>The program is currently funded through revenues from the AHUR (Arizona Highway User Revenue)/gas tax, CCF (Capital Construction Fund) and the Transportation 2050 sales tax revenues.</p></div>
Prioritization<div class="ExternalClass9ACFC216F4884BBFB2E5C565A49C29D7"><p>To determine the order and priorities of which streets will receive pavement overlays, Streets utilizes a pavement management system (PMS) methodology. The foundation of PMS is field data obtained using a high-tech pavement management vehicle, which measures and records the condition of roads, evaluating them on surface roughness, environmental stresses, and structural condition. Based on the resulting pavement condition index (PCI) rating, which is measured 0-100 (worst to excellent), staff uses these objective measurements of roadway conditions to develop an initial list of roads to receive an asphalt overlay.</p><p>Once it is developed, the initial list of roads is put through a rigorous coordination review, which includes evaluating the following:</p><ul><li>Coordination or conflicts with other City projects</li><li>Right of way concerns</li><li>Environmental issues</li><li>Utility issues or conflicts</li><li>Field visual inspections</li><li>Pavement age</li><li>Roadway traffic volumes</li><li>Alternate treatments</li><li>Economic and community impacts</li></ul><p>Although objective criteria are used in identifying roads in greatest need of maintenance, staff strives to closely balance street maintenance activities and funding equitably across the city within resource limitations. </p></div>
Pavement Life<div class="ExternalClassF745F2CAAB8E45BBA1DC13307E94E3B6"><p>Asphalt pavement is designed to be flexible which allows it to adapt to the wide temperature swings that occur in Arizona. Following initial construction, pavement begins the process of oxidation, which is basically the evaporation of the oils in the pavement. Over time, the pavement becomes dry, brittle, more rigid, and less flexible. Repeated traffic loading also contributes to the degradation of the pavement over time.</p><p>The aggregate starts wearing away, causing cracks. Some small cracks can start to show in the first year of new pavement. The city of Phoenix strives to provide a quality maintenance program to extend the life cycle of asphalt 25-30 years and even up to 40 years saving taxpayer’s money while providing safe and efficient roadways. See the Maintenance and Resurfacing Techniques section for commonly used pavement maintenance techniques.</p><p> </p></div>
Pavement Overlay & Preservation Treatments <div class="ExternalClassA4370D4DE7A94C4C97A6E518095E08C5"><h2>​Pavement Mill and Overlay</h2><p>Although there are numerous pavement preservation treatments and maintenance options, the most effective and complete maintenance approach, yet also the most costly, is a mill and overlay of the asphalt pavement. Making the call to overlay is a very important decision that involves a lot of factors.  These factors include maintenance history, physical condition and budget.</p><table width="100%" class="ms-rteTable-default" cellspacing="0"><tbody><tr><td class="ms-rteTable-default" style="width:33.33%;"><strong>​Treatment</strong></td><td class="ms-rteTable-default" style="width:33.33%;"><strong>​Description</strong></td><td class="ms-rteTable-default" style="width:33.33%;"><strong>​Street Type</strong></td></tr><tr><td class="ms-rteTable-default">​Mill and Overlay</td><td class="ms-rteTable-default">​A “mill & overlay” is a street maintenance technique that requires the removal of the top layer (2 inches) of a street by the grinding action of a large milling machine. After the top layer is removed, a new layer of pavement is put in its place. Asphalt resurfacing is necessary when the asphalt surface has reached the end of its service life or preventative treatments no longer benefit a road.</td><td class="ms-rteTable-default">​All Streets</td></tr></tbody></table><h2></h2><h2>Pavement Preservation</h2><p>Pavement preservation treatments are applied to streets to replenish lighter oils and rejuvenate the roadway in order to prolong its service life. Because the cost of applying preservation  treatments is minimal compared to resurfacing the roadway, Phoenix makes an effort to utilize preservation treatments to extend the service life of streets throughout the city. </p><p style="text-decoration:underline;">The Need For Pavement Preservation</p><ul><li>Extends pavement life.</li><li>Delays the need for costly rehabilitation or reconstruction.</li><li>Improves the overall network condition by keeping good roads good.</li><li>Improves pavement condition and helps maintain road conditions safe for users.</li></ul><p>Examples of the preservation treatments used in the city of Phoenix are listed below. </p><table width="100%" class="ms-rteTable-default" cellspacing="0"><tbody><tr style="text-align:left;"><td class="ms-rteTable-default" style="width:33.33%;"><p><strong>Treatment</strong><strong> </strong></p></td><td class="ms-rteTable-default" style="width:33.33%;"><strong>Description</strong></td><td class="ms-rteTable-default" style="width:33.33%;"><strong>Street Type</strong></td></tr><tr><td class="ms-rteTable-default"><p>Micro-seal</p><p> </p></td><td class="ms-rteTable-default">Application of coarse sand aggregate and a polymer modified emulsion mixture, used on streets that are in fair to good conditions to provide a new wearing surface.</td><td class="ms-rteTable-default"><p>Arterial Streets</p><p>Major Streets</p></td></tr><tr><td class="ms-rteTable-default">Crack Seal</td><td class="ms-rteTable-default">Filling cracks in the pavement with modified asphalt rubber on streets in relatively good condition.</td><td class="ms-rteTable-default">All Streets</td></tr><tr><td class="ms-rteTable-default"><p>Tire Rubber Modified Surface Sealant (TRMSS)</p><p> </p></td><td class="ms-rteTable-default"><p>Thin spray of emulsified asphalt that is used to rejuvenate pavement that is starting to oxidize.</p><p>Adds a small amount of binder to the top of the asphalt to help hold pavement together.</p></td><td class="ms-rteTable-default"><p>Arterial Streets</p><p>Major Streets</p></td></tr><tr><td class="ms-rteTable-default"><p>Polymer Modified Master-seal (PMM) Seal Coat</p><p> </p></td><td class="ms-rteTable-default">PMM is a modified seal coat that contains some a mineral reinforcement and higher solid content than conventional seal coats. It adds small amounts of binder and mineral solids on top of the asphalt to seal and lock in the existing asphalts, oils and aggregates in the pavement Surface. PMM is primarily used on Local and Minor Collector streets that are starting to oxidize.</td><td class="ms-rteTable-default"><p>Arterial Streets</p><p>Local Streets</p><p> </p></td></tr><tr><td class="ms-rteTable-default"><p>Fractured Aggregate Surface Treatment (FAST)</p><p> </p></td><td class="ms-rteTable-default">FAST is used on streets that have large enough cracks and defects beyond slurry seal or that will otherwise need an overlay. This treatment involves applying a membrane of polymer modified asphalt rubber followed by a layer or two of fractured rocks that have been pre-coated with asphalt. FAST can be used on local, collector and arterial streets. </td><td class="ms-rteTable-default">All Streets</td></tr><tr><td class="ms-rteTable-default"><p>Slurry Seal (Residential Streets)</p><p> </p></td><td class="ms-rteTable-default">Slurry seal is a mixture of emulsified asphalt and fine aggregate (i.e., sand) applied to local streets to replace the loss of fine aggregate, protect the original surface, and provide a new wearing surface. To be most effective, the treatment should be applied to low volume streets with little cracking, usually to pavements less than ten years old.</td><td class="ms-rteTable-default">Local Streets</td></tr></tbody></table></div><div class="ExternalClassA4370D4DE7A94C4C97A6E518095E08C5"><strong> </strong></div><p><strong>Street Classifications</strong></p><div class="ExternalClassA4370D4DE7A94C4C97A6E518095E08C5"><p><strong>Arterials</strong> are major streets, which are typically the major north/south and east/west transportation corridors spaced at each mile.  </p><p><strong>Collectors</strong> are important transportation corridors generally running on the ½-mile north/south and east/west streets between the arterial streets.  </p><p><strong>Local</strong> streets are typically in residential areas, and provide connectivity between the collectors and arterials for local traffic.  </p></div>
Preparation / Schedule / Map<div class="ExternalClass6E30645E717E417AB9DDED6F028B4577"><h3>Preparation</h3><p>Prior to resurfacing a street, concrete work such as curb, gutter, and sidewalk repairs, valley gutter installations, and ADA ramp repairs/retrofits must be completed, including crack sealing. Federal Law requires that ADA sidewalk ramps be installed as part of the local, major, collector-street overlay and micro seal programs. The ramps are installed under a Concrete Services Contract months before the street is scheduled to be resurfaced. </p><h3><strong>Schedule</strong></h3><p>The Street Transportation Department is currently planning and prioritizing which streets will be overlaid three to four years from today. Streets that will be resurfaced in the next one to two years have already been identified and are in the middle of the preparation process. Streets are reevaluated every year, as surface conditions may change due to weather, traffic volume, etc. </p><p>Street pavement overlay projects are performed at optimal temperatures, and due to Phoenix’s long seasonal temperatures, pavement overlay projects are completed from early spring to late fall. </p><p> <a href="/streetssite/Documents/2021%20Pavement%20Maintenance%20Program.pdf">Proposed Street Preservation Work Plan for Calendar Year 2021</a> </p><p> <a href="/streetssite/Documents/2020%20Pavement%20Maintenance%20Program.pdf">Proposed Street Preservation Work Plan for Calendar Year 2020 </a> </p><p> <a href="/streetssite/Documents/2019%20Pavement%20Maintenance%20Program.pdf">Proposed Street Preservation Work Plan for Calendar Year 2019 </a> </p><p> <a href="/streetssite/Documents/2018%20Pavement%20Maintenance%20Program.pdf">Proposed Street Preservation Work Plan for Calendar Year 2018 </a> </p><p> <a href="/streetssite/Documents/ProposedProgramsFor%20FY%202017.xlsx" target="_blank">Proposed Street Preservation Work Plan for Calendar Year 2017</a>  </p><p> <a href="/streetssite/Documents/Proposed%20Street%20Preservation%20Work%20Plan%20for%20CalendarYear2016.xls">Proposed Street Preservation Work Plan for Calendar Year 2016</a>  </p><p><span aria-hidden="true"></span>Note: Work plans are subject to change. Factors that may affect the work plans include, but are not limited to, budgetary constraints, material availability, weather conditions that are not conducive to quality resurfacing or unforeseen circumstances, some of which arise after the resurfacing project has begun.<span aria-hidden="true"></span></p><h3><a href="">Pavement Preservation & Overlay Map</a></h3><p>This map features completed and upcoming pavement preservation and resurfacing projects. Street overlay work associated with major street improvement projects is also included in this map. This map allows you to select a street and see the type of pavement preservation treatment that is planned for the street and the fiscal year the work is scheduled to take place. This information can be accessed by selecting a street on the map and zooming in. </p></div>
Notification <div class="ExternalClassC6063BD792064C49A16E0485125DF134"><p>​Providing advance warning of roadwork and convenience for businesses and residents is a top priority during the street resurfacing process. Notification is provided via door hanger to those properties adjacent to where the resurfacing activity will be taking place two to seven days in advance of the work. Note, before and after the actual resurfacing, work crews may be seen performing other work on the street. Street resurfacing typically occurs in the spring, summer and fall. Crack seal activity typically occurs in the winter. Although the roadwork is scheduled around commute hours, the details of what to expect are different for each type of resurfacing activity. Most commonly, no vehicles will be allowed on the street during the resurfacing process and the street will be closed for a portion of the day.</p></div>
Safety Tips for the Traveling Public<div class="ExternalClass6B8522E293EE465D9938B76FFFDFC257"><p>​•  Slow down when driving through or near any road construction site<br>•  Be alert for construction workers and law enforcement officers<br>•  The milled street before the new layer of asphalt is applied will have a rough surface - drivers, cyclists and pedestrians are advised to use caution</p></div>
Requests for Street Maintenance<div class="ExternalClass8E22A5A52FBA41F4BDB1448BD4540C7B"><p>To submit a request for street maintenance contact the Street Maintenance Dispatch Office at <strong>602-262-6284</strong> or email <a href=""></a>.</p><p>Depending on the nature of your request, a supervisor responsible for your area will evaluate the street and contact you to confirm the how your request will be addressed.</p></div>