There are three classifications of roads within the Township of South Stormont: Provincial, County, and Township roads. Each road network has a different level of service.
- Provincial roads, managed by Ontario Ministry of Transportation are responsible for Highway 138, 401 and 417.
- SDG County Roads are identified by number within a white “Keystone” or “Flowerpot” symbol. County roads are designed to a higher standard with a wider platform and asphalt surface. These are generally longer roads joining municipalities across SD&G.
- Municipalities are responsible for the smaller, collector roads and neighbourhood streets. Township roads are identified by name and can have either an asphalt or gravel surface.