Methods and factors of prioritizing roads for maintenance: a review for sustainable flexible pavement maintenance program

Road construction and maintenance project involve a huge capital investment. Therefore, to be a good road transportation planner, one should give prime attention to maintenance of existing road. If a road is well maintained over the period with proper and adequate techniques its remaining service life will increase automatically. In this study, a detailed literature survey is done among the various factors, techniques and models used by various researchers in different studies, and based on literature review best factors, techniques and models are discussed. Major factors that are responsible for pavement deterioration as per study are distress, condition of pavement (measured in terms of Pavement Condition Index), the utility value of road, total traffic on road, climatic conditions of area and type of road. Finally models of pavement maintenance are categorized into three major categories Deterministic, probabilistic, and biologically inspired models and various aspects of all models are discussed in detail.