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why are these popular and being used to replace cloverleafs? |
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A '''partial cloverleaf interchange''' or '''parclo''' is a modification of a [[cloverleaf interchange]].
The design has been well received, and has since become one of the most popular [[freeway]]-to-[[arterial road|arterial]] [[Interchange (road)|interchange]] designs in North America.{{why}} It has also been used occasionally in some [[Europe]]an countries, such as [[Germany]], [[Hungary]], [[Italy]], the [[Netherlands]], and the [[United Kingdom]].
[[File:Matkus business area from air.jpg|right|thumb|alt=Diagram of a partial cloverleaf highway interchange|An aerial view of a parclo B2 featuring roundabouts connecting [[Finnish national road 5|Highway 5]] and [[Matkus Shopping Center]] in [[Kuopio]], [[Finland]].<br />{{coord|62|49|16|N|27|36|40|E}}]]
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==Implementation==
[[File:Autobahn anschluss1.jpg|thumb|An [[Autobahn]] parclo interchange variation in [[Germany]].<br />{{coord|47.6413|n|10.5278|e}}<br />The [[Nesselwang]] interchange on [[Autobahn 7]]]]
In [[California]], [[Caltrans]] currently has a policy{{Citation needed|date=September 2011}} that whenever cloverleaf interchanges between freeways and surface streets are being rebuilt, they are turned into parclo interchanges by removing some of the loop ramps (or in rare cases bridges will be added between adjacent loop ramps—see [[cloverleaf interchange]] for details).{{why}}
Various forms of parclo interchanges are used on the [[North Luzon Expressway]] in the [[Philippines]]. The configuration of parclo interchanges allows for the consolidation of toll barriers at points where onramps and offramps run alongside each other. A single large barrier can serve each onramp/offramp pair simultaneously, reducing construction and operation expenses at through junctions. When possible, such as at terminal junctions, [[trumpet interchange]]s are preferred since they only require one large toll barrier for all four on/off-ramps.
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