The following streets and avenues or portions thereof, located within the City limits, are designated as four-lane streets and roadways:
Central Avenue
From the east line of Ninth Street to the west line of Fifteenth Street.
Tenth Avenue South
From the west City limits to the east City limits.
Central Avenue West
From the west abutment of the First Avenue North Bridge to west line of Interstate 15.
Fourteenth and Fifteenth Streets North
From the south line of Twelfth Avenue North to the south abutment of the Fifteenth Street North Bridge.
First Avenue North
From west abutment of First Avenue North Bridge to west line of Park Drive.
Park Drive
From south line of First Avenue North to north line of First Avenue South.
Sixth Street SW
From Central Avenue West, south to City limit.
Northwest Bypass
From Third Street Northwest, west to City limits.
Third Street Northwest/Smelter Avenue
From Central Avenue West, northeast to City limits.
Ninth Street North
From 8th Avenue North to south abutment of Tenth Street North Bridge.
Tenth Street North
From north abutment of Tenth Street North Bridge, north to City limits.
Fox Farm Road
From Tenth Avenue South to Alder Drive.
River Drive
From Tenth Street North to Fifteenth Street North.