ABSTRACT : Route location is an important aspect of highway engineering., It proceeds a comprehensive transportation planning and. forms basis to highway design. Â route selection study is a multidisciplinary job. The common participated members are economist» archtiect,, city planner, environmentalist, sociologist, geomorphologist, and engineers. In engineering sense, geological study includes geological mapping, identification of major geological structures, lilhological propertics, hydrogcological characteristics» geomorphological features, natural slopes, distribution and types of mass movements,, distribution of aggregate sources (pit and quarries), and so forth, These items are effective on cost - benefit analysis and route evaluation as well as highway design characteristics. The main purpose here, is a scientific information spreading of general criteria of a route location study. Type, trend, and extent; of faults can control route, location. If the situation is properly understood, it may help to locate route in order to minimize related stability -problems along; an alignment. Folds, bedding attitudes» lithological contacts,, and intensity of joints and. fractures have effect on stability of motorway structures.. Engineering characteristics of the prevailing liihologies are quite important in the mute location study. Recognition of drainage pattern, seeps and. springs,, swamps, and marshy soft grounds, interrelationships between natural slopes and mass movements, surface and .groundwater conditions,, and their` basins future use (long term) plans have also significant role, in route location., Gravel - sand and crushed rock have place value rather than unit vale,. Therefore their analysis in. terms of quantity, quality, and areal distribution may also have influence, on route location, and as well as. highway design.