In this work, we present a domain ontology for Transportation System. We have developed an ontology for a semantics-aware transportation system from the perspective of a traveler user, capable of answering general competence queries like the nearest bus stop to a particular place, the nearest parking slots available, etc. We have studied the transportation system of some of the big cities of the world and have tried to come up with a vocabulary that can be applied to any city with little modifications. This vocabulary is further aligned with an upper-level ontology to have a common starting point.