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 of grade separation
An Americanism dating back to 1930–35
Words nearby grade separation
grade iv astrocytoma,
grade line,
grade point,
grade point average,
grade school,
grade separation,
grade-schooler,
gradeability,
graded post,
gradeflation,
gradely