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A dual carriageway road (North American English: divided highway) has two roadways separated by a central reservation (North American English: median). A local-express lane system (also called collector-express or collector-distributor) has more than two roadways, typically two sets of 'local lanes' or 'collector lanes' and also two sets of ...
The highway returns to Interstate standard for about 50 miles until it reaches the Sault Ste. Marie International Bridge, which carries undivided lanes to the Canada–US border in the middle of the bridge, where I-75 terminates. The Thousand Islands Bridge, which carries I-81 over part of the Saint Lawrence River, is an undivided two-lane road.
strada extraurbana secondaria (meaning secondary road) or type-C road. This category contains all the roads in non-urban context that are neither autostrada (type A) nor strada extraurbana principale (type B). This means that a dual carriageway that may not be classified as type-B road, since it does not meet such quality standards, belongs to ...
A somewhat related concept is a "four-lane undivided freeway". This is much rarer; a current example is U.S. Route 101 in California through Humboldt Redwoods State Park. In Europe, the concept of express road encompasses roads which are classified between a motorway and an ordinary road. It does not necessarily have two lanes.
An undivided highway (American English) is the term used for motorways with two or more lanes with no central reservation/median strip. Road traffic safety is generally worse for high-speed single carriageways than for dual carriageways due to the lack of separation between traffic moving in opposing directions.
The west leg of the intersection is a two-lane undivided road that provides access to a residential subdivision. MD 212A reduces to a two-lane undivided road as it heads southeast through Beltsville. The highway intersects Rhode Island Avenue, then veers east and intersects US 1 (Baltimore Avenue). At this point, MD 212A becomes signed as MD 212.
The alignment is the route of the road, defined as a series of horizontal tangents and curves. The profile is the vertical aspect of the road, including crest and sag curves, and the straight grade lines connecting them. The cross section shows the position and number of vehicle and bicycle lanes and sidewalks, along with their cross slope or ...
The state highway continues east as a two-lane undivided road paralleling US 50 on the north at a distance, passing farms and residences. At the intersection with MD 589 (Racetrack Road) in Grays Corner, access across is restricted, with MD 707B ending and MD 707E beginning. MD 707E parallels US 50 closely until the end of state maintenance ...