Numbered highways in Sierra

 in Sierra are split into four primary types of systems, the Interprovincial Highways, K.S. Highways, provincial highways, and county highways. Other systems include the National Park Highways, Scenic Route Highways, and Reservation Highways. All highways are organized by a route number and/or a letter, often related to its general cardinal orientation (north-south, west-east) and geographic location. One of the world's largest highway network, the modern Sierran highway project began in 1949 in response to Sierra's growing demographics and infrastructure. Deemed one of the most ambitious projects in human history, by 1980, nearly 10,000 miles of roads were built or under construction.

The Interprovincial Highway and K.S. Highway Systems are a network of highways that transverse over multiple provinces built to standardized regulations and specifications and is overseen by the federal government. Ultimately, all highways, especially the provincial highways, are the responsibility of the provinces themselves who maintain all roads and highways subject to their jurisdiction. As such, virtually all of the provinces have departments, agencies, and law enforcement bodies dedicated solely for the maintenance, upkeep, and protection of the highway systems.