Subproblem 6b - Page 1 of 3
Consideration of a Grade-Separated Flyover
Step 1. Setup
It was demonstrated in
Problem 5 that signalization would provide adequate capacity for the
projected traffic volumes at this intersection, but v/c ratios would
approach 90% and delays would be well into the LOS E range, especially for
the minor movements. Further improvements are likely to require the
elimination of conflicting movements by means of grade separation.
The HCM considers
competing movements that are grade separated to be conflict-free. Therefore
an HCM analysis of the benefits of a grade separation will usually involve
the elimination of movements from the intersection.