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  2. Virginia State Route 620 (Fairfax and Loudoun Counties)

    en.wikipedia.org/wiki/Virginia_State_Route_620...

    It ends at the roundabout with SR 705 (Lightridge Farm Rd.) in Stone Ridge. Braddock Road, now designated SR 705, continues northwest to US 15 near Gilberts Corner. Braddock Road where it forms the border of North Springfield. Among the cities, towns and other landmarks traversed by SR 620 are:

  3. Gilberts Corner, Virginia - Wikipedia

    en.wikipedia.org/wiki/Gilberts_Corner,_Virginia

    A design memorandum was produced in 2003, followed by full construction design documents. Project construction began in 2007, with various elements of the project completed and some underway. "Lessons Learned "Roundabouts were used to address traffic congestion and safety at key intersections such as Route 50 and Route 15 at Gilberts Corner.

  4. Highway Capacity Manual - Wikipedia

    en.wikipedia.org/wiki/Highway_Capacity_Manual

    It contains concepts, guidelines, and computational procedures for computing the capacity and quality of service of various highway facilities, including freeways, highways, arterial roads, roundabouts, signalized and unsignalized intersections, interchanges, rural highways, and the effects of mass transit, pedestrians, and bicycles on the ...

  5. Virginia State Route 20 - Wikipedia

    en.wikipedia.org/wiki/Virginia_State_Route_20

    Two new roundabouts have been approved to be implemented along SR 20. The first would be at the intersection of SR 20 and SR 231 in Somerset. Construction is expected to begin in 2020. [6] [7] The second roundabout would be at the intersection of SR 20 and US 33 just south of Barboursville. This project might also include reconstruction of the ...

  6. Three-level diamond interchange - Wikipedia

    en.wikipedia.org/wiki/Three-level_diamond...

    It is similar in design to a three-level stacked roundabout except for its use of (usually signalled) conventional intersections, and can be thought of as two diamond interchanges fused together. Road enthusiasts sometimes use the terms volleyball interchange or split-level diamond interchange to refer to these interchanges.

  7. Are new roundabouts causing more accidents at intersections ...

    www.aol.com/news/roundabouts-causing-more...

    The circular design of the roundabout “forces drivers to slow down” and decreases the likelihood of head-on collisions, resulting in fewer fatal crashes. The continuous flow of traffic also ...

  8. Turnaround (road) - Wikipedia

    en.wikipedia.org/wiki/Turnaround_(road)

    The following junction types typically permit U-turns but are not designed specifically for that purpose. Normal at-grade intersections on divided highways often allow traffic traveling on the divided highway to perform a U-turn, often when there is a green light for traffic turning onto the side road, crossing the opposing lanes (left turns in countries where traffic drives on the right ...

  9. Diverging diamond interchange - Wikipedia

    en.wikipedia.org/wiki/Diverging_diamond_interchange

    No standards currently exist for this design. The design depends on site-specific conditions. Additional signage, lighting, and pavement markings are needed beyond the levels for a standard diamond interchange. Local road should be a low-speed facility, preferably under 45 mph (72 km/h) posted speed on the crossroad approach.