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Sub-problem 5a - Page 3 of 7

ID# C205A03

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.

Exhibit 2-55. I-87 Interchange Southbound-to-Eastbound Off-Ramp
Case Density Speed LOS
AM Existing 20.9 54 C
AM Without/With 21.3 54 C

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