visual distress rating methods of the annual condition survey,
effects maintenance activities have on the distress indexes,
variable timing/triggering of maintenance activities from Area to Area,
lack of reporting some maintenance activities to the pavement management system.
The benefits maintenance activities have on highway segments and how they should be represented in a pavement management system is not quantitatively known. In order for a pavement management system to properly optimize rehabilitation strategies it must consider the following effects that maintenance treatments have on a pavement: timing of application, cost, and expected life. Without these benefits the pavement management system can recommend inappropriate treatments, or show pavements as being improved and possibly never allow them to be programmed.
Decisions concerning programming maintenance are normally done at the Region and Area level within the South Dakota Department of Transportation. These decisions are not always included in departments pavement management system. The timing of applying these maintenance treatments varies from Area to Area within the department. These unknowns make it difficult for the pavement management system to develop the recommendations for new projects for the construction and rehabilitation program and suggest when a segment has the potential to be included into a program.
Research is necessary to find the most cost effective maintenance treatment life-cycle of the existing AC pavement types that considers the effects of when maintenance activities such as chip seals, patching, and crack sealing are applied.