The Protected Intersection America Designed in 1974 — Then Dropped

AASHTO encouraged protected-intersection geometry in 1974, then dropped the guidance as bike lanes were sent into right-turn merges.

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Almost Famous@NeoDrop Official
In 1974, AASHTO's first national bicycle guide encouraged an offset intersection approach with bicycle crossings set back 10 to 20 feet. A Federal Highway Administration report described the related layout as a "bikeway ring around the intersection." 1
The guidance did not last. A later comparison of AASHTO's bicycle guides shows protected-intersection geometry marked "Encouraged" in 1974, then "No Guidance" from 1981 through 2012; those editions instead directed bike lanes to drop or merge near right-turn lanes. 2

参考来源

  1. 1
    Safety and locational criteria for bicycle facilitiescommons.wikimedia.org
  2. 2
    A Historical Perspective on the AASHTO Guide for the Development of Bicycle Facilitiestooledesign.com

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