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  2. Interstate Highway standards - Wikipedia

    en.wikipedia.org/wiki/Interstate_Highway_standards

    Through urban areas, at least one routing is to have 16-foot (4.9 m) clearances, but others may have a lesser clearance of 14 feet (4.3 m). Sign supports and pedestrian overpasses must be at least 17 feet (5.2 m) above the road, except on urban routes with lesser clearance, where they should be at least 1 foot (30 cm) higher than other objects.

  3. Controlled-access highway - Wikipedia

    en.wikipedia.org/wiki/Controlled-access_highway

    Before the implementation of alpha-numeric route markers, controlled-access highways were marked with a Metroad, National Highway, National Route or State Route Marker. In Sydney , Metroad route markers were used for motorways and freeways, except the Pacific Motorway (then F3 Freeway), which was marked with a National Highway marker.

  4. List of business routes of the Interstate Highway System

    en.wikipedia.org/wiki/List_of_business_routes_of...

    As the main purpose of these routes is to serve a certain downtown or urban area, business Interstates are typically routed along surface roads rather than limited-access freeway segments. This allows the business route to directly connect to and navigate a local street network, providing more accessible connections to the central business ...

  5. List of countries by road network size - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_road...

    This is a list of countries (or regions) by total road network size, both paved and unpaved.Also included is additional data on road network density and the length of each country or region's controlled-access highway network (also known as a motorway, expressway, freeway, etc.), designed for high vehicular traffic.

  6. Road hierarchy - Wikipedia

    en.wikipedia.org/wiki/Road_hierarchy

    Bundesautobahn 9 near by Garching bei Muenchen, Germany. At the top of the hierarchy in terms of traffic flow and speed are controlled-access highways; their defining characteristic is the control of access to and from the road, meaning that the road cannot be directly accessed from properties or other roads, but only from specific connector roads.

  7. Limited-access road - Wikipedia

    en.wikipedia.org/wiki/Limited-access_road

    The Veterans Memorial Parkway in London, Ontario is a modern at-grade limited-access road with intersections. A limited-access road, known by various terms worldwide, including limited-access highway, dual-carriageway, expressway, and partial controlled-access highway, is a highway or arterial road for high-speed traffic which has many or most characteristics of a controlled-access highway ...

  8. National Highway System (United States) - Wikipedia

    en.wikipedia.org/wiki/National_Highway_System...

    A map of the Strategic Highway Network, one component of the NHS Map of average freight truck traffic on the NHS in 2015. According to the Federal Highway Administration, the 160,000-mile (260,000 km) National Highway System includes roads important to the United States' economy, defense, and mobility, from one or more of the following road networks (specific routes may be part of more than ...

  9. Geometric design of roads - Wikipedia

    en.wikipedia.org/wiki/Geometric_design_of_roads

    The selection of lane width affects the safety, maximum capacity, and cost, of a highway. Safety is best at a width of 3.0 to 3.1 metres (9.8 to 10.2 ft) in urban settings, where both narrow (less than 2.8 metres (9 ft 2 in)) and wide (over 3.1 metres (10 ft)) lanes have higher crash risks.