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Intersection Sight Distance

Intersection Sight Distance. Case D – Intersections with Traffic Control Prepared by: Zach MacDonell Kia Ilkhanipour Adam Ramos. General Case. The vehicle stopped on one approach, should be visible to the first vehicle stopped on all the other approaches.

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Intersection Sight Distance

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  1. Intersection Sight Distance Case D – Intersections with Traffic Control Prepared by: Zach MacDonell Kia Ilkhanipour Adam Ramos

  2. General Case The vehicle stopped on one approach, should be visible to the first vehicle stopped on all the other approaches. Generally, no approach or departure sight triangles needed for signalized intersections. Signalization provides an appropriate crash countermeasure for intersections with high traffic volumes and limited sight distance.

  3. Exception 1: Two-way Flashing Operation (2-lane highway) Flashing yellow on the major-road approaches Flashing red on the minor-road approaches Off-peak or nighttime conditions Case B1 departure triangles should be applied for the left turn from the minor road Refer to Exhibit 9-54 on pg 660 of AASHTO Geometric Design of Highways and Streets 2004

  4. Exception 1: Two-way Flashing Operation (with Minor Road Upgrade) Flashing yellow on the major-road approaches Flashing red on the minor-road approaches Off-peak or nighttime conditions 5% upgrade on minor approach Case B1 departure triangles should be applied for the left turn from the minor road Refer to Exhibit 9-54 on pg 660 of AASHTO Geometric Design of Highways and Streets 2004

  5. Exception 1: Two-way Flashing Operation (2-lane highway) Flashing yellow on the major-road approaches Flashing red on the minor-road approaches Off-peak or nighttime conditions Case B2 departure triangles should be applied for the right turn from minor road Refer to Exhibit 9-57 on pg 664 of AASHTO Geometric Design of Highways and Streets 2004

  6. Exception 1: Two-way Flashing Operation (with Minor Road Upgrade) Flashing yellow on the major-road approaches Flashing red on the minor-road approaches Off-peak or nighttime conditions 5% upgrade on minor approach Case B2 departure triangles should be applied for the right turn from minor road Refer to Exhibit 9-57 on pg664 of AASHTO Geometric Design of Highways and Streets 2004

  7. Exception 2: Right Turn on Red Permitted (2-lane highway) Applies if right turns on a red signal are permitted on any approach Case B2 departure triangles should be applied for the right turn from a given approach Refer to Exhibit 9-57 on pg 664 of AASHTO Geometric Design of Highways and Streets 2004

  8. Exception 2: Right Turn on Red Permitted (with Minor Road Upgrade) Applies if right turns on a red signal are permitted on any approach 5% upgrade Case B2 departure triangles should be applied for the right turn from a given approach Refer to Exhibit 9-57 on pg 664 of AASHTO Geometric Design of Highways and Streets 2004

  9. Exception 3: Right Turn on Red Permitted (with Median on Major Road) Applies if right turns on a red signal are permitted on any approach Case B2 departure triangles should be applied for the right turn from a given approach Refer to Exhibit 9-57 on pg 664 of AASHTO Geometric Design of Highways and Streets 2004

  10. Exception 3: Two-way Flashing Operation (with Major Road Median and Minor Road Upgrade) Flashing yellow on the major-road approaches Flashing red on the minor-road approaches Off-peak or nighttime conditions 5% upgrade on minor approach Case B1 departure triangles should be applied for the left turn from the minor road Refer to Exhibit 9-54 on pg 660 of AASHTO Geometric Design of Highways and Streets 2004

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