Problem 3: Basic Freeway Sections

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This problem is focused on the complex of interchanges located on the eastern end of Alternate Route 7. The main emphasis is on the interchange between Route 7 and I-787.

Exhibit 4-39 contains a diagrammatic picture of the interchange complex on the eastern end of Alternate Route 7. As can be seen, the Route-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 Route-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, Exhibit 4-39 also shows the locations where specific analyses will be focused:

1. Westbound weave on Route-7 as it crosses the Hudson River.

2. Eastbound weave on Route-7 as it crosses the Hudson River.

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

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

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

6. Eastbound diverge on Route 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 Route 7 east and the semi-direct loop ramp coming from Route 7 west.

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

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

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

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

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