Traditional Intersection

TditilTraditional ItIntersec tions vs. Bowtie Intersections Bowties are similar to Median U‐turns ‐ left‐turns are not allowed. Instead, rihight turns and u‐turns are requidired. The U‐turns are made with roundabouts. Traditional Intersection Traditional iiintersection signal cycle has 4 phases – 2 for left turns 2 for through movements Traditional Intersection 4 Phase Signal Cycle Times* 10% 6% 22% 62% lefts straight through *average intersection 75% of the traffic (through movement) gets only about 60% of the cycle time Too much time spent on left turns and yellow signals (transition between movements) Innovative Intersection Innovative intersection signal cycles have only 2 (or 3) phases – left turns are moved or redirected Innovative Intersections create more green time 4 Phase Signal ItiInnovative 2 Phase Cycle Times Signal Cycle Times 6% 4% 10% 6% 22% 62% 90% lefts straight straight through through 75% ‐ 80% of traffic 100% of traffic gets 90% of time – gets only about 60% of time no waiting for left turns Bowtie Intersections Advantages Disadvantages • narrow right‐of‐way • left‐turns travel • pedestrian friendly greater distance • aesthetics • lower capacity on cross street • development can • left turns/u‐turns use/incorporate restricted between roundabouts roundabout and main iiintersection Bowtie Intersection Flows Bowtie Intersection Flows As with regular roundabouts, like this one in Las Vegas, left turns are restricted nearby. Drivers proceed around the roundabout and return to their destination. Possible Bowtie Application New Library location COMPASS’ High Volume Intersection Study suggested a Bowtie for the Ustick & Cole Intersection in Boise, shown above. As wihith regular roundbdabouts, lfleft turns are restridicted nearby. Drivers proceed around the roundabout and return to destination. Possible Bowtie Application New Library location COMPASS’ High Volume Intersection Study suggested a Bowtie for the Ustick & Cole Intersection in Boise, shown above. As wihith regular roundbdabouts, lfleft turns are restridicted nearby. Drivers proceed around the roundabout and return to destination. Typical Mall and Strip Commercial Could be anywhere in America Sea of asphalt Heavy traffic Is it hopeless or does it have potential? Potential Improvement Remove left‐ turn lanes from center Replace with landscaped medians, add roundabouts Route left turns to roundabouts and create bowtie intersections Potential Improvement A bowtie system for the area could do several things: Add beauty Create/establish neighborhood identity Improve traffic and pedestrian safety Improve traffic flow Bowtie Intersection Existing Locations While there are no known complete Bowtie Intersections, there are a number of Roundabout or Oval intersection examples that can help illustrate or visualize them: •Avon Road in Avon, Colorado •Blvd Hermanos Serdanos in Puebla, Mexico •Segunda/Calle 29 interchange in Soler (Tijuana), Mexico •Summerlin Village Center in Las Vegas, Nevada •US 130/Route 47 in Brooklawn, New Jersey For more information visit compassidaho.org Bowtie Intersection Probably the most aesthetic of all innovative intersection designs No known existing bowtie intersections U‐turn point at roundabout can be signalized or remain un‐signalized Thank You For more information visit compassidaho.org Air photos sources include Google Earth, COMPASS, and Clark County.

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SIMULATION of DIFFERENT INTERSECTION DESIGN for IMPROVING TRAFFIC FLOW with FACTORS CONSIDERING LOCATION, POPULATION and DRIVER EXPECTANCY Sourabh Kumar Singh Dr
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