Traditional Intersection

Transcription

1 Traditional lintersections ti vs. Roundabout Intersections Most people are familiar with roundabout concepts, but may not be accustomed to dii driving through hthem. Roundabouts have proven to be a safe alternative ti to standard dinstersections. ti Traditional intersection i signal cycle has 4 phases 2 for left turns Traditional Intersection 2 for through 2 for through movements

2 Traditional Intersection 4 Phase Signal Cycle Times* 10% 6% 22% lefts 62% 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) Roundabout Intersection Intersections with stop signs, whether 4 way or 2 way also have some delay for cars moving through them A roundabout is quite different in that all legs/approaches to the intersection can be treated equally all vehicles turn right All vehicles slow down to enter the roundabout When other vehicles are in the roundabout, there is some delay to enter No delay to exit No two roundabouts are alike they are designed for the specifics at the intersection

3 Left turns are restricted near roundabouts, like this one in Las Vegas. Drivers proceed around the roundabout and return to their destination. Access Management Driver Destination Access management includes the use of medians, turning lanes, turn arounds/roundabouts, and consolidated driveways to increase safety and improve roadway function. It is very important to manage access near roundabouts. Drivers should proceed around the roundabout and return to destination instead of making a left turn.

4 Access Management Driver Destination Access management includes the use of medians, turning lanes, turn arounds/roundabouts, and consolidated driveways to increase safety and improve roadway function. It is very important to manage access near roundabouts. Drivers should proceed around the roundabout and return to destination instead of making a left turn. Roundabouts, and roundabout features, are used as part of other innovative intersections like bowties and hamburgers.

5 Bowtie Intersection Bowtie intersections use two roundabouts, set in a crosstreet away from the main intersection, Bowtie intersections can accommodate more vehicles per hour to accommodate left lfturns and allow more traffic to flow smoothly through the main intersection. than a single roundabout or a standard intersection. Hamburger Intersection Hamburgers, or through about intersections, also use roundabout features to manage turning movements at key intersections. Everett, MA

6 Hamburger Intersection Hamburger intersections have been built in several locations inthe eastern USand in Mexico: o Everett, MA Revere Beach Pkwy & Mystic View Rd o Fairfax, VA Arlington Blvd & Lee Hwy o Cherry Hill, NJ Kaighns Ave & Church Rd o Marlton, NJ Route 73 & Marlton Pike o Saltillo, MX Blvd Los Fundadores & Blvd Morelos o Tijuana, MX Cuauhtemoc &Paseo Centenario Tijuana (near Rio Tijuana shopping mall) and several are in the Playas de Tijuana/Jardines del dlsol neighborhood h Roundabouts in Urban Form Las Vegas, NV Summerlin Village Center Circle In some cases, roundabouts are much more than just intersections they have become part of the urban form and the neighborhood pattern.

7 Roundabouts in Urban Form Paris, France Place de l Etoile In some cases, roundabouts are much more than just intersections they have become part of the urban form and the neighborhood pattern. Roundabout Intersection Good potential for aesthetic improvements with landscaping, public art, etc. In many cases uses roughly the same amount of right of way as standard intersection No signals needed for traffic control, but pedestrian crossing signals may be desired Thank You For more information visit compassidaho.org Air photos sources include Google Earth, COMPASS, and Clark County