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In the U.S. state of New Jersey, county routes exist in all 21 counties. They are typically the fourth type of roadway classified below the Interstate Highway, the U.S. Route numbered highway and the state highway. The County Route system is defined by two types in New Jersey. First, 500 Series County Routes, also called state secondary routes (to the state highway), are county highways numbered in a statewide system with three-digit numbers that begin with 5. These roads form a second network of routes that supplement the facilitation of the State Routes. By definition, 500 Series routes cross county borders and maintain continuity. Each 500 Series route is unique and is not permitted to be duplicated in another county for a separate route. The second category is defined as Non-500 Series County Routes. Non-500 Series County Routes include 1-digit, 2-digit, 600 Series, 700 Series and 800 Series. These, by definition, are discontinuous across county borders and must be contained entirely within that county. Unlike 500 Series County routes, these route numbers are unique to each county, and are typically assigned to more local routes than the statewide 500-series county route system. They are typically of a lesser classification of streets like minor arterials or collector roadways rather than major arterials or thoroughfares. In the counties that use 600-series numbers, the selection of this range was coordinated within the state, gradually replacing older systems of mainly one- and two-digit routes.〔(Historical Maps of New Jersey )〕 With very rare exceptions (such as County Route 537), the 500 series follows the rule of cardinal direction used for Interstate Highways and U.S. Routes: even-numbered roads run east and west, while odd-numbered roads run north and south. East–west routes tend to be numbered with the lowest numbers in the northern part of the state and the highest numbers in the southern part of the state, also like the U.S. Routes. In northern New Jersey, north–south routes range from CR 501 in the east to CR 521 in the west, although numbering in the southern part of the state tends to be more haphazard. County route numbers have not wholly replaced the preexisting names of the local roads to which they were assigned. Street signs at major intersections will denote both the local road name and the county route number if it has one. Residents who live along county routes rarely, if ever, give their address as "123 County Route 5xx" unless no name for the route has been established, as is the case in some rural areas. ==History of the 500-series== The precursor to the 500 series was a group of three roads in Bergen County which received the numbers 200, 201, and 203 in the late 1930s. 200 ran from Oakland to Alpine; 201 ran from Ridgewood to Alpine; and 203 ran from Weehawken to Alpine. US 202 runs through Bergen County, thus the planners skipped this number. In February 1942, a group of civil defense routes was assigned with numbers in the 500s in New York, New Jersey, and Connecticut. These roads were designed as through routes for civilian use in case the state highway system was needed by the military during World War II operations. These routes were numbered in relation to existing routes. For example, Civil Route 501 ran parallel to US 1 and Civil Route 532 was an extension of NY 32 into New Jersey. The current series of roads in the 500s was established by the New Jersey Department of Transportation (NJDOT) in 1952. Some of the roads had spurs or alternate routes established; about one-third of these survive today even though such designations were eliminated from the primary state system in the 1953 New Jersey State Highway renumbering. (The others have become 600-series county routes as described below.) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「County routes in New Jersey」の詳細全文を読む スポンサード リンク
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