The iconic cloverleaf freeway interchange is now recognized for the bottleneck it is. Flyover ramps are the new approach.
"So ubiquitous is the cloverleaf design with its four circular ramps -- resembling a four-leaf clover -- that cultural critic Lewis Mumford once joked that it had become the national flower... A 1999 study by the Virginia Department of Transportation concluded that cloverleaf interchanges begin to bog down when traffic surpasses 1,000 vehicles per hour. During peak rush hours, the cloverleaf intersection of the Riverside (91) Freeway and the Pomona (60) Freeway now being rebuilt at a cost of $317 million for four years of construction carries about 14,600 vehicles per hour in each direction."
Thanks to g edward freeman
Read the full story: A Major Lane Change
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City of Rosemead
Rutgers University, Edward J. Bloustein School of Planning and Public Policy
One Hundred Miles
University of Michigan School for Environment and Sustainability (SEAS)
Hunter College, City University of New York (CUNY)
The Architects Foundation
City of Cambridge
The Pocatello Development Authority
The Urban Renewal Agency of the City of Pocatello