main drag 
noun (usually the main drag) North American informal
The main street of a town.A sign on Highway #2, the main drag through the village, directed me left onto Wharf Road....
- Continuing into town, the tour bus turns down the main drag, Broadway, where wooden sidewalks run alongside colorful false-front buildings.
- There's not an empty storefront on Oak Street, the main drag through this former orchard-and-lumber hub on the Columbia River.