Sub-problem 5a: I-87 Interchange - Merges and Diverges on the Freeway

Southbound-to-Eastbound Off-Ramp
Exhibit 2-55 shows the performance of the southbound-to-eastbound loop ramp. The density is 20.9 vehicles-per-lane-per-mile in the AM Existing condition and 21.3 in the AM Without/With condition. There’s no change in volumes between the two. The LOS is C in both cases. You can study this ramp either by treating the adjacent ramp as being the upstream off-ramp or the downstream on-ramp. The latter condition provides the greater densities and thus poorer levels of service, as reported. You can click here to see the two datasets.