Pavement Management Program
Purpose of the Study
Municipal Utilities and Engineering Department in conjunction with the department of Innovative Technologies have developed a citywide 2012 Pavement Management Program (PMP). In developing this program, the physical condition of City street surfaces were evaluated, rated, and the projected life cycle determined. The PMP further identifies a schedule for maintenance and reconstruction of City streets at the appropriate time in order to extend their overall life-expectancy in the most efficient and economical manner. In addition, the PMP establishes a comprehensive process to prioritize rehabilitation of the City’s roadway system and will be used as a powerful tool in the decision-making process in order to best utilize the City’s available financial resources.
Other advantages of this program include:
- Improving the quality of the City’s streets in a fiscally responsible manner;
- Implementing a plan that considers both immediate and long-term needs;
- Promoting transparency by educating public on the decision-making process involving selection and utilization of street improvement funds throughout the City.
Pavement Management Program (view below)
C: Appendix B- Matrix Method Criteria Maps
Summary of Findings
The street network within the City includes over 292 street miles or approximately 640 lane miles of Asphalt Concrete paved streets within the City limits.
The Department of Innovative Technology staff utilizes eRoads Pavement technology, or simply “eRoads”, as an automated pavement evaluation system that creates a database of the current inventory of City street conditions, treatment options, and cost estimates for each treatment available. Using this system, staff has confirmed that due to the lack of comprehensive and systematic maintenance of the City’s road systems over a number of years, the City’s average Pavement Condition Index (PCI) has dropped to 53 on a scale of 0 – 100. An average PCI of 53 is considered poor in reference to industry standards and in comparison to the condition of streets in surrounding cities. The condition of a road is affected by several factors including traffic loading and moisture intrusion during its lifecycle.
Various rehabilitation and resurfacing methods are available to maintain the road surface, each with their own benefits and expected service life. The appropriate treatment must be selected for these road conditions, many of which are described in the PMP report.
New pavement deteriorates slowly at first and then at a continually increasing rate. This deterioration can be significantly slowed by use of systematic preventive maintenance starting in the early stages of a pavement’s lifecycle. Examples of different pavement conditions and related PCI values are shown within the report for reference.
Analysis and Recommendations
In the last two years, with the availibility of funds, the City has been maintaining streets that are still in good condition and rehabilitating the streets that are in fair or worse condition in order to improve the City’s average PCI rating. However, a comprehensive multiyear approach was deemed necessary to reduce the rapid deterioration of most streets within the City limits.
PMP identifies two specific methodologies: The “Matrix” method and The “Vehicle Miles Traveled” (VMT) method - to prioritize streets for resurfacing and maintenance treatment. The recommended treatment for every street has also been determined in the eRoad system. The decision to utilize either of the referenced methodologies or a hybrid of the two for prioritizing resurfacing implementation, is directly related to the existing physical condition of each street and availability of funds and resources.
The Matrix Method for prioritization factors in a variety of criteria impacting the general use of streets such as PCI, Average Daily Traffic (ADT), truck routes, vicinity to schools and population density, etc. This methodology takes advantage of an in-depth analysis provided by the eRoad system and usage of advanced GIS technologies. The result is a “big-picture” approach that shows graphically the streets that warrant treatment based on function, location, and the condition of the street surface.
The VMT method is the most efficient engineering approach in prioritizing street repairs. This methodology uses ADT as well as cost of street rehabilitation to queue streets for repairs. Each day there are 814,000 vehicle-miles traveled on the City streets. Using the traffic volumes as a guide for choosing streets for repair leads to the most cost-effective approach in terms of dollar per mile traveled on a daily basis.
Ideally, we strive to use Best Management Practices in the most cost effective and timely manner to achieve an average PCI rating of 66 or better. A street system maintained at this level is considered to be in optimum state. At this level, maintenance costs would remain at a minimum while the street standard would be maintained at a better quality.
This plan is a living document that will be updated when necessary and reported to City Council annually.