The growing traffic volume on roads and increasing demand for stronger, more durable and safer pavements have led to the search for new materials, design procedures and more cost efficient solutions. As a result, more innovations in design procedures and construction technique are taking place. An extensive network of highways and airfields constructed with long lasting pavements is essential to the growth of an economy, which depends largely on efficient transportation for commercial, business and personal uses Flexible pavements are most common type of construction. A number of factors including climatic and traffic loading influence the performance of flexible pavement. ? There is an urgent necessity to have performance based specification and use of innovative high performance materials for construction of bituminous pavements ? By improving strength and durability of mixes both reduction in layer thickness and increase in life can be brought. ? Recycling of flexible pavements helps to conserve precious stocks of rock aggregates and depleting petroleum resources. ? Conventional bituminous mixes have been found inadequate to provide durable performances. ? SMF is generally most expensive than the typical dense graded HMA.