When.com Web Search

  1. Ad

    related to: aashto green book free

Search results

  1. Results From The WOW.Com Content Network
  2. American Association of State Highway and Transportation ...

    en.wikipedia.org/wiki/American_Association_of...

    Some noteworthy AASHTO publications are: [9] A Policy on Geometric Design of Highways and Streets, often called "The Green Book" because of the color of its cover.This book covers the functional design of roads and highways including such things as the layout of intersections, horizontal curves, and vertical curves.

  3. Level of service (transportation) - Wikipedia

    en.wikipedia.org/wiki/Level_of_service...

    The following section pertains to only North American highway LOS standards as in the Highway Capacity Manual (HCM) and AASHTO Geometric Design of Highways and Streets ("Green Book"), using letters A through F, with A being the best and F being the worst, similar to academic grading. A: free flow. Traffic flows at or above the posted speed ...

  4. Design speed - Wikipedia

    en.wikipedia.org/wiki/Design_speed

    The concept of design speed is evolving. The definition in the 1994 edition of the AASHTO Green Book, [10] was "the maximum safe speed that can be maintained over a specified section of highway when conditions are so favorable that the design features of the highway govern. The assumed design speed should be a logical one with respect to the ...

  5. Geometric design of roads - Wikipedia

    en.wikipedia.org/wiki/Geometric_design_of_roads

    The primary US guidance is found in A Policy on Geometric Design of Highways and Streets published by the American Association of State Highway and Transportation Officials (AASHTO). [2] Other standards include the Australian Guide to Road Design Archived 2011-11-09 at the Wayback Machine, and the British Design Manual for Roads.

  6. Operating speed - Wikipedia

    en.wikipedia.org/wiki/Operating_speed

    In 1994, the AASHTO Green Book [1] defined the operating speed as "the highest overall speed at which a driver can travel on a given highway under favorable weather conditions and under prevailing traffic conditions without at any time exceeding the safe speed as determined by the design speed on a section-by-section basis," a definition which ...

  7. United States Numbered Highway System - Wikipedia

    en.wikipedia.org/wiki/United_States_Numbered...

    The route numbers and locations are coordinated by the American Association of State Highway and Transportation Officials (AASHTO). [4] The only federal involvement in AASHTO is a nonvoting seat for the United States Department of Transportation. Generally, most north-to-south highways are odd-numbered, with the lowest numbers in the east and ...

  8. Green Book - Wikipedia

    en.wikipedia.org/wiki/Green_Book

    Green Book an 1880-1883 ship's register, one of the progenitors, along with the Red Book of Lloyd's_Register A Policy on Geometric Design of Highways and Streets , or The Green Book , a publication by the American Association of State Highway and Transportation Officials on roadway and street engineering design

  9. Drainage gradient - Wikipedia

    en.wikipedia.org/wiki/Drainage_gradient

    Typically on straight road sections, the drainage gradient is at least 1–3% due to the normal cross slope of 1–3%. In curved sections the drainage gradient is higher, and may often reach 5–12% due to superelevated CS that may reach 5–8% in areas with icy roads and up to 12% in areas without icy roads.