Allegheny County Belt System | |
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System information | |
Maintained by ACDPW, PennDOT and city agencies | |
Length | 280.5 mi (451.4 km) |
Highway names | |
Interstates | Interstate nn (I-nn) |
US Highways | U.S. Route nn (US nn) |
State | Pennsylvania Route nn (PA nn) |
The Allegheny County Belt System color codes various county roads to form a unique system of routes in Allegheny County, Pennsylvania, and around the city of Pittsburgh.
Unlike many major American cities with belt systems composed of number-coded limited-access roads, the Allegheny County Belt System roads are not intended to be used as high-speed routes. Rather, the system is a navigational aid for motorists in unfamiliar portions of the county.[1] Five routes were introduced in the early 1950s: from outermost to innermost, the Red, Orange, Yellow, Green, and Blue Belts. The Purple Belt was added later. All roads in the system retain their original names.