grade separation

noun
separation of the levels at which roads, railroads, paths, etc., cross one another in order to prevent conflicting rows of traffic or the possibility of accidents.

Origin:
1930–35, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
It is not practical to develop warrants governing the construction of pedestrian grade separation facilities.
Such an objective can be obtained via crossing consolidation, closure and/or grade separation of the two modes of transportation.
Investment in a grade separation structure is long-term and impacts many users.
The grade separation overhead is to be a concrete box girders bridge structure on concrete piers and abutments.
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