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Route number
:''Not to be confused with a Numbered street
A route number or road number is often assigned to a stretch of public roadway. The number chosen is often dependent on the type of road, with numbers differentiating between interstates, motorways, arterial thoroughfares, two-lane roads, and so forth.
==United Kingdom==
In the United Kingdom, the road number consists of a letter followed by a number of up to 4 digits. For example, the historical main road from London to Edinburgh is called the A1, the "A" in Britain indicating a first class route, classified as more important than "B" roads. The A2, A3, A4, A5, A6 also radiate out from London (in clockwise order) to points around the coast. All classified roads starting in the zone between the A1 and the A2 begin with the figure 1 (A137, B1412), etc. Scotland is similarly divided into zones by the A7, A8 and A9 which radiate out from Edinburgh. Motorways are marked by an M, for example the M25, which forms a ring road around London. Motorways are fast freeways and are generally larger than "A" roads. Motorways follow different zoning and numbering systems from "A" and "B" roads.
A similar clock-face zonal system is used in many other European countries (for example, Spain or Belgium).
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「Route number」の詳細全文を読む
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