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High Volume Intersection Study
COMPASS Board Presentation
prepared for
Community Planning Associationof Southwest Idaho
For more information on the project, please contact eitherthe COMPASS Project Manager or the Consultant Project Manager.
Don Matson, Project ManagerCOMPASS, Principal Plannerdmatson@compassidaho.org208.855.2558 ext. 230
Ryan Christenson, Project ManagerWilbur Smith Associates, Sr. Traffic Engineerrchristenson@WilburSmith.com801.363.3955 ext. 313 March 17, 2008
submitted by
Wilbur Smith Associatesin association with
High-Volume Intersection Study
WHY INNOVATIVE INTERSECTIONS?
Collision Rates Per 100 Million Vehicle-Miles
0
200
400
600
800
1000
1200
1400
Two-way left turn lane Conventional with median Median U-turn
Efficiency
Performance
Safety
High-Volume Intersection Study
MAKING A LEFT TURN AT A CONTINUOUS FLOW INTERSECTION (CFI)
Main
intersection
Left turn crossover
1. Queue at
crossover point
2. Cross over opposing
through movement
3. Complete maneuver at main intersection
High-Volume Intersection Study
MAKING A LEFT TURN AT A MEDIAN U-TURN OR BOWTIE INTERSECTION
From Cross Street to Main Street
From Main Street to Cross Street
1. Queue at main
intersection
Main intersection Turnaround point
2. Go through and queue
at turnaround point
3. Make U-turn and turn
right at main intersection
1. Queue at main
intersection
Main intersection
Turnaround point
2. Turn right and queue
at turnaround point
3. Make U-turn and go
through main intersection
High-Volume Intersection Study
Bowtie Intersection
High-Volume Intersection Study
MAKING A LEFT TURN AT A QUADRANT ROADWAY INTERSECTION
Single Quadrant Roadway
Double Quadrant Roadway
Left-Left
Right-Left-Through
Right-Left-Through
Left-Left
Three right turns
Through-Left-Right
Left-Left
Right-Left-Through
High-Volume Intersection Study
THE TOWN CENTER INTERSECTION
High Volume Intersection Study
COMPASS Board Presentation
prepared for
Community Planning Associationof Southwest Idaho
For more information on the project, please contact eitherthe COMPASS Project Manager or the Consultant Project Manager.
Don Matson, Project ManagerCOMPASS, Principal Plannerdmatson@compassidaho.org208.855.2558 ext. 230
Ryan Christenson, Project ManagerWilbur Smith Associates, Sr. Traffic Engineerrchristenson@WilburSmith.com801.363.3955 ext. 313 March 17, 2008
submitted by
Wilbur Smith Associatesin association with
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