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We need "Cloverleaf interchanges" in Bangalore
Friday, August 12, 2005
Many of the existing flyovers (Example: Silk-board junction on hosur road) in bangalore can be easily made signalless intersection with little modification similar to "Cloverleaf interchange". Hebbal interchange is another disaster. With so many flyovers one would expet signalless interchange, but still there are signals. After investing so much on these huge flyovers and we still have signals means we need to rethink about our designs! Is it not?
OK what is "cloverleaf interchange?
From: www.kurumi.com/roads/interchanges/cloverleaf.html
History
The first cloverleaf opened in New Jersey (at routes 4 and 25, which are now US 1/9 and NJ 35) in 1929; it is scheduled to be replaced with a diamond interchange around 2004. The interchange was under consideration for the National Register of Historic Places, but was declined, primarily because of the many safety and capacity-related alterations to it over the years: "widening and curb replacements for both roadways, revised geometry for one ramp, placement of a center barrier on Rt.US 1&9, removal of bridge pilasters, and the addition of modern lights and guide rails." Thanks to Raymond C. Martin for this information.
Typically a cloverleaf is used where a freeway intersects a busy surface street, though many older freeway-freeway interchanges are also cloverleafs. As we'll see, the full cloverleaf is not considered as applicable in some situations now as it might have been a few decades ago; in several places cloverleafs have been replaced with either signalized interchanges or higher-capacity directional interchanges with flyovers.
The cloverleaf is the simplest way to connect two freeways. The only bridges required are to separate the two roadways. If land is expensive, so too can be the cloverleaf, which becomes a choice between tight turning radii (and lower design speed) or lots of consumed land. You'll notice that most loop ramps are banked to counteract centrifugal forces.
A small advantage that "falls out of the design" is the "second chance:" if you miss the first ramp to the right, you can simply take three loops in a row to get back on track. (I've also used two loops of a cloverleaf to make a U-turn.)
For more information use Keyword "cloverleaf interchange" for google search.
OK what is "cloverleaf interchange?
From: www.kurumi.com/roads/interchanges/cloverleaf.html
History
The first cloverleaf opened in New Jersey (at routes 4 and 25, which are now US 1/9 and NJ 35) in 1929; it is scheduled to be replaced with a diamond interchange around 2004. The interchange was under consideration for the National Register of Historic Places, but was declined, primarily because of the many safety and capacity-related alterations to it over the years: "widening and curb replacements for both roadways, revised geometry for one ramp, placement of a center barrier on Rt.US 1&9, removal of bridge pilasters, and the addition of modern lights and guide rails." Thanks to Raymond C. Martin for this information.
The Full Cloverleaf
The classic cloverleaf allows "non-stop" full access between two busy roads. Traffic merges and weaves, but does not cross at-grade; unless the interchange is too congested, no stopping is required. The colloquial "cloverleaf" is the same as the more technical "full cloverleaf", as you can omit ramps to get a partial one.Typically a cloverleaf is used where a freeway intersects a busy surface street, though many older freeway-freeway interchanges are also cloverleafs. As we'll see, the full cloverleaf is not considered as applicable in some situations now as it might have been a few decades ago; in several places cloverleafs have been replaced with either signalized interchanges or higher-capacity directional interchanges with flyovers.
The cloverleaf is the simplest way to connect two freeways. The only bridges required are to separate the two roadways. If land is expensive, so too can be the cloverleaf, which becomes a choice between tight turning radii (and lower design speed) or lots of consumed land. You'll notice that most loop ramps are banked to counteract centrifugal forces.
A small advantage that "falls out of the design" is the "second chance:" if you miss the first ramp to the right, you can simply take three loops in a row to get back on track. (I've also used two loops of a cloverleaf to make a U-turn.)
For more information use Keyword "cloverleaf interchange" for google search.
