Indicates a position or surface.

पर

English Usage: The signs are placed on the road for guidance.

Hindi Usage: संकेत सड़क पर मार्गदर्शन के लिए लगाए गए हैं।

A physical roadway or path for vehicles.

सड़क

English Usage: The car broke down on the road.

Hindi Usage: कार सड़क पर खराब हो गई।

Referring to an action taking place along the roadway.

सड़क पर

English Usage: The children are playing on the road.

Hindi Usage: बच्चे सड़क पर खेल रहे हैं।