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Sub-problem 3a - Page 12 of 12 Sub-problem 3a: Weaving Analysis Let’s look at our second idea, the addition of a lane. Just upstream on I-787 northbound there is a two lane off-ramp, which effectively acts as a lane drop. Here we’ll examine the idea of maintaining that third lane through the weaving segment. The analysis results are presented in Table 6.
The impacts of the lane addition are significant. At the margin the LOS improves from F to D. The lane addition may also increase the free flow speed on the freeway (at location E) that would further improve the LOS to C. The weave at location E has shown the importance of considering multiple time periods, the effects of the free flow speed and peak hour factors, and the importance of geometric design in a weaving segment. Weaving Segment D. The weaving movements at location D are far more complex. There is an upstream merge on the on-ramp and a lane drop in the middle of the weaving section. This weaving segment will be thoroughly examined in Sub-problem 2c. Weaving Segment M. The weaving movements at Location M are also not traditional. The location a collector/distributor road located southerly of Route 7. There is single through lane with an additional lane between the I-787SB/Rte7EB on-ramp and the Rte7EB/I-787NB off-ramp. This section will be discussed in detail in sub-problem 2d. |
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