The core of the network is the reference roads, which are major trans-regional routes.

East-west oriented reference roads have a two-digit number with the second digit a 0.

Branch, link and connecting roads are less important routes, and are identified with a three-digit number.

The core of the network is the reference roads, which are major trans-regional routes.

Branch, link and connecting roads are less important routes, and are identified with a three-digit number.