National roads in Castine

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The highway network of Castine consists of Autoroutes, Federal Routes, and Parish Highways.

Autoroutes are dual carriageway, controlled-access highways along their entire length with a minimum of two travel lanes in each direction. Autoroutes must also adhere to standards of construction and layout that permit safe travel at speeds of 100 km/hr in urban areas and 120 km/hr elsewhere. The few exceptions to these conditions are found in tight mountain passes where topography requires turns that are too tight to safely be taken at 120 km/hr.

Some Federal Routes and some Parish Highways are also controlled-access along part or even all of their length. Most commonly, though, Federal Routes are dual carriageways with at-grade intersections while Parish Highways are two- to four-lane divided highways. In rural areas, though, Federal Routes may also be no more than two-lane highways. On the other hand, some Parish Highways, for example the Périphérique circling the Saules de Victorin urbanized area [1] are built to Autoroute standards along their entire lengths. Highways such as these are usually given Autoroute designations eventually, since the designation unlocks Federal funding for upkeep and improvements. As the table summarizes, these peripheral or spur Autoroutes are named differently to distinguish them from their nation-crossing cousins.

Type Designation Example Shield
Autoroute There are just 10 numbered cross-country Autoroutes in Castine. Odd-numbered routes run North-South with Autoroute 1 located farthest west, near the densely-populated coastline. In the north of Castine, Autoroute 9, the farthest east, runs along the Burgyama river valley. To the east, several hundred km of Castine are far distant from the Autoroute network. Almost all of this territory is sparsely-populated desert and little future road-building is expected. Even-numbered Autoroutes, fairly uniformly spaced at 100 km intervals, run East-West with Autoroute 2 farthest to the north. Hiway flower 10west.png
Spur or Orbital Autoroute These Autoroutes may be as short as a few km (as is the case for some spur routes leading into central city areas) or extend to tens or up to 100 km (orbital highways around major urban agglomerations, spur highways to urban centers distant from any 1-10 Autoroute). They carry the number of the nearest numbered Autoroute plus a letter, with the letter carrying no special significance. These autoroutes almost always intersect with the 1-10 Autoroute whose digit they carry. Hiway flower 2d.png
Federal Route Federal Routes are numbered 11-99. The numbering scheme follows the same logic as applies for the 1-10 Autoroutes. Federal routes almost always cross at least one Parish border. It is also not uncommon, though sometimes confusing, for a Federal Route to end only to resume hundreds of km later along generally the same line of longitude or latitude. Hiway pipes 13north.png
Parish Highway These always carry a 3-digit identifier with the two-letter Parish abbreviation displayed at the top vertex of the pentagonal shield. Thanks to the federated structure of Castine, each Parish follows its own logic (or sometimes no logic at all) when assigning the identifiers. Adding to the chaos, Parish Highway numbers may include additional identifiers, e.g., 'S', 'N', 'Alt', and so on. Naming conventions naturally differ from Parish to Parish. The only element of structure provided by Motorways Castine is that each Parish is restricted to a unique range of 3-digit identifiers. For example, Grande Vallée highway numbers must fall between 300 and 350 (but nothing stops GV from assigning route numbers such as 'GV 314A' and 'GV 327 bis'!). Fv 151.png

Text on the route shields, as well as on Castine highway signage generally, may be displayed in Ingerish, Franquese, or both -- Motorways Castine does not regulate this. Parishes are responsible for signing all roads in their territory, including Federal Routes and Autoroutes, so as usual in Castine practices vary widely. Given the similarities between the languages and the majority-bilingual population, most parishes elect to display only the predominant language of their region on signage. Exceptions are often made for more complex signage, for instance signs giving travelers detailed instructions on a detour.

Example Signage

Signs displaying distances (in km) to control cities and major junctions can be found at 5-10 km intervals on Castine's Autoroutes, more irregularly on Federal and Parish highways. The two examples shown below follow the convention of a black-on-yellow route identifier above a white-on-green display of distances.

Interchange signage generally employs yellow lettering on a sky-blue (midnight blue in some Parishes) background. Distances to at least one waypoint along the intersecting route are usually shown. The example here comes from a particularly infamous circle-type interchange between two Autoroutes, a Federal Route, and one of the more important of Grande Vallee's Parish Highways.