Pavement Maintenance is the major activity for upkeeping of any highway in good condition especially for flexible pavement and for planning future maintenance requirements, prediction of pavement distresses plays a major role. In India, Cracking in Flexible pavement is one of major distresses which is mainly cause due to low pavement strength and heavy traffic loading apart other factors such as age, materials, environment and construction quality. This paper is the theoretical study and analysis of impact of traffic and pavement strength, on cracking of flexible pavement from Indian Highways prospect. The deterioration equations of flexible pavement used in this study for analysis are deterioration models of HDM-4, Indian models (Jain et al. 2005) and MEPDG. The first two models are empirical based on historical pavement distress data whereas the third model is mechanistic empirical model based on materials properties, stress/ strains in Pavement layers and historical pavement distress data.