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A road number is a number assigned to a stretch of road, or a long distance route. The number usually depends on the type of road, e.g., interstates, motorways, A-roads, freeways etc. In some countries, such as the United Kingdom , the number usually has a letter followed by a number of up to 4 digits. For example, the main road from London to Edinburgh is called the A1 (the "A" in Britain indicates a first class route, more important than "B" roads). In other countries, such as the United States , the situation is a bit more complicated. Interstate Highway s and United States Highways are identified with letter prefixes; for example, the interstate between Boston and Seattle is called I-90 , while the federal highway linking Maine to Florida is called US 1 . Texas uses the "IH-" designation for its interstate highways, thus naming them "IH-35" , "IH-610" , and such. However, the numbering system for State Highway s varies widely from state to state. A state may choose to use letter prefixes for all, some, or none of its state roads. For example, the Virginia Department Of Transportation does not use letter prefixes for state primary or secondary routes, but does use an "F" prefix for Frontage Road s. Although the state's two-letter designation usually becomes a prefix for the route, some states, like Michigan , prefer to use a single-letter prefix (such as "M-28"). Indeed, a state may choose to give a route an entirely alphabetic designation, such as the lettered county routes in Missouri and Wisconsin . Some routes may carry a letter suffix, such as E/W (for East/West) or N/S (for North/South). Other lesser-known suffixes include A (for Alternate), B (for Business) and C (for City). Complicating the issue further is the fact that some states have distinct numbering systems for primary and secondary routes or for state routes and County Road s. For example, in Virginia, the primary and secondary road systems have Numbering Ranges that are, with rare exceptions, mutually exclusive. Certain fictional road numbers have been set aside for use in TV shows or Films . SEE ALSO
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