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A stack interchange is a type of grade-separated junction between two controlled-access highways that allows for free-flowing movement in all directions. Learn about the definition, history, and examples of stack interchanges in the United States and other countries.
A diverging diamond interchange (DDI) is a type of diamond interchange where the non-freeway road crosses the freeway on the opposite side of the road. Learn about the history, advantages, and examples of DDIs in the US and France.
A cloverleaf interchange is a two-level interchange with slip roads that allows two highways to cross without traffic lights. It has a four-leaf or three-leaf shape and may have collector/distributor roads to reduce weaving.
Learn how exit numbers are assigned and used on freeways and highways in different states and regions of the US. Compare distance-based and sequential numbering schemes, and see examples and exceptions.
Contraflow lane reversal is the altering of the normal flow of traffic on a highway to aid in an emergency evacuation or facilitate road construction. Learn about the different types, examples, and methods of contraflow lane reversal in various countries and regions.
A limited-access road is a highway or arterial road for high-speed traffic with limited or no access to adjacent property and some degree of separation of opposing traffic flow. The term is used worldwide, but the definition and implementation vary by jurisdiction.
Kentucky has plans to upgrade the remaining section of the Purchase Parkway and work with Tennessee to reconstruct the current interchange at the south end of the Purchase Parkway in South Fulton, Tennessee to provide a free-flow connection to the existing U.S. 51 freeway to Union City, while Tennessee finished I-69 bypass of Union City. [8]
Learn about the history, design, and features of the U.S. Highway network, an integrated system of roads and highways numbered within a grid in the contiguous United States. Find out how the system is coordinated by AASHTO, how it relates to the Interstate Highway System, and what are the exceptions and special routes.
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