The words "on road" refer to being on a paved surface or a main thoroughfare. There are several synonyms that can be used to describe this concept, including "on the street," "on the highway," "on the pavement," "on the concrete," and "on the asphalt." Other synonyms for on the road include "en route," "traveling," "journeying," "commuting," and "driving." These words all convey the idea of being in motion on a road or street. Using different synonyms can add variety and interest to your writing, while still conveying the same basic meaning.