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 n.Gloss: Partial cloverleaf exchange. «The Ontario Ministry of Transportation designed a modification to the original cloverleaf to address its shortcomings for the 400-series highways. The redesign creates more room for acceleration and deceleration and avoids the notoriously dangerous weaving lane. The Parclo has been embraced throughout the world as one of the most popular freeway-to-arterial interchange designs.» —“ Partial Cloverleaf Interchange (Parclo)” The Canadian Design Resource Sept. 24, 2009. (source: Double-Tongued Dictionary)

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  • The word “exchange” should be changed to “interchange”. Actually there are two types of Parclo interchanges, Parclo A and Parclo B. Here’s how you tell the difference. Consider the freeway running east and west, and the crossing road running north and south. This interchange is divided into four parts, called quadrants. Quadrants are lettered, from A to D. Quadrant A is the northeast quarter of the interchange, Quadrant B is the southeast quarter, Quadrant C is the southwest quaeter, and Quadrant D is the northwest quarter. If the on and off ramps are located in quadrants A and C, then that is a Parclo A interchange. If the on and off ramps are located in quadrants B and D, then that is a Parclo B interchange. Of course there are many modifications to these basic designs, but such modifications do not have any official names. Having said that, there are a few other special freeway interchange designs, such as the Rotary the Diamond, the Cloverleaf, and the Trumpet.

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