Problem 3: Basic Freeway Sections

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Figure 2-1 contains a diagrammatic picture of the interchange complex on the eastern end of Alternate Route 7. As can be seen, the Rte-7/I-787 interchange is basically a cloverleaf with one semi-direct ramp. Originally, the plan was to have I-787 continue eastward, through Troy, and overlap the Rte-7 alignment to the Vermont border. The idea was squelched when it became clear that the freeway alignment through Troy would involve taking many homes and effectively closing Hoosick Street, a major arterial.

Consistent with Table 1 in the introduction, Figure 2-1 also shows the locations where specific analyses will be focused:

1. Eastbound weave on Rte-7 as it crosses the Hudson River.

2. Westbound weave on Rte-7 as it crosses the Hudson River.

3. Northbound weave on I-787 between the 23^rd street interchange and the Rte 7 interchange

4. Southbound weave on I-787 between the 23^rd street interchange and the Rte 7 interchange

5. Northbound weave on I-787 between the loop ramps

6. Eastbound diverge on Rte 7 that leads to both the right-hand ramp to I-787 and the auxiliary lane that connects to the loop ramps to and from I-787

7. Southbound merge between the right-hand ramp coming from Rte 7 east and the semi-direct loop ramp coming from Rte 7 west.

8. Southbound merge between the combined ramp from G above and I-787 south.

9. Westbound merge between Rte 7 and the loop ramp coming from I-787 north.

10. Westbound merge between Rte 7 and the right-hand ramp coming from I-787 south.

11. Eastbound merge between the auxiliary eastbound lane on Rte 7 and the loop ramp coming from I-787 southbound.

12. Eastbound diverge involving the auxiliary eastbound lane on Rte 7 and the loop ramp leading to I-787 northbound.

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