Roads, defined as a path connecting two points, are generally classified into a hierarchy. At the top of the hierarchy are freeways (US) (UK: motorways), which serve entirely a function of moving vehicles between other roads. Freeways are grade-separated and limited access, have high speeds and carry heavy flows. Below freeways are arterials. These may not be grade-separated, and while access is still generally limited, it is not limited to the same extent as freeways, particularly on older roads. These serve both a movement and an access function. Next are collector/distributor roads. These serve more of an access function, allowing vehicles to access the network from origins and destinations, as well as connecting with smaller, local roads, that have only an access function, and are not intended for the movement of vehicles with neither a local origin nor destination. Local roads are designed to be low speed and carry relatively little traffic.
The design of roads is specified in a number of design manual, including the AASHTO Policy on the Geometric Design of Streets and Highways (or Green Book). Relevant concerns include the alignment of the road, its horizontal and vertical curvature, its super-elevation or banking around curves, its thickness and pavement material, its cross-slope, and its width. Fundamentals of Transportation/Geography and Networks
The A1 motorway (Croatian: Autocesta A1) is the longest motorway in Croatia spanning 454.5 kilometers (282.4 mi). As it connects Zagreb, the nation's capital, to Split, the second largest city in the country and the largest city in Dalmatia, the motorway represents a major north–south transportation corridor in Croatia and a significant part of the Adriatic–Ionian motorway. Apart from Zagreb and Split, the A1 motorway runs near a number of major Croatian cities, provides either access to several national parks or nature parks and world heritage sites and numerous resorts, especially along the Adriatic Coast. The motorway is currently being extended south of Split to the port of Ploče and the city of Dubrovnik. National significance of the motorway is reflected through its positive economic impact on the cities and towns it connects as well as its importance to tourism in Croatia, however its genuine importance as a transit route shall be achieved upon completion of the Adriatic–Ionian motorway along the sections currently spanned just by the Adriatic Highway and two-lane roads in Slovenia and Albania connecting to the route.
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