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From page 1...
... Summary NCHRP Report 687: Guidelines for Ramp and Interchange Spacing assists roadway planners and designers as they consider the feasibility of new or rebuilt interchanges and ramps. The Guidelines are not intended to set ramp and interchange spacing standards.
From page 2...
... design and signing considerations, and Chapter 4 presents traffic operations and safety considerations. Chapter 5 provides users with a framework for evaluating the adequacy of ramp and interchange configurations with regard to spacing and includes insights into factors that influence minimum dimensions.

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