"Main road" is a term used to describe a major, well-traveled route that connects different areas or towns. It is usually the primary pathway for vehicles and often has more traffic compared to other roads. Full definition
We are on main road located along the state road D - 1. (hosteltraveler.com)
For example, encouraging car sharing, and safe walking routes away from main roads. (neu.org.uk)
I would love to have one for my home as we live on a very busy main road with a river less than a quarter mile away that attracts many people. (theinspiredroom.net)