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Sub-problem 1c - Page 6 of 9

ID# C101C06

Sub-problem 1c: Analysis of Future Conditions

For signal control (see Exhibit 1-13):

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The intersection as a whole operates at level of service B, both with the existing volumes and the projected future volumes. Average delays are low, in the range of 10 to 11 seconds per vehicle.

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The critical v/c ratio for the intersection is 0.34, indicating the intersection has a significant amount of excess capacity. The fact that the critical v/c ratio is so low is also an indication that average control delays can be reduced even more by using a shorter cycle length (providing, of course, that all minimum green times are still maintained).

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The eastbound and westbound approaches (formerly the minor street approaches, Styner Avenue and Lauder Avenue) operate at level of service C, both with the existing volumes and the projected future volumes, with average control delay varying between 20 and 25 seconds per vehicle.

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The northbound and southbound approaches (on U.S. 95) both operate at level of service A, with average control delay varying between 6 and 7 seconds per vehicle.

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The 95th-percentile back-of-queue is significantly longer under signal control than under stop sign control. This means that drivers trying to enter or exit nearby driveways may experience difficulty at times when the queue blocks either the driveway or their view of oncoming traffic. The predicted queue lengths are not so long, however, that they are in danger of blocking any upstream intersections.

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No lane group operates at less than level of service C.

bulletNo lane group is projected to operate with a volume/capacity ratio greater than 0.60.

Discussion:
Let's consider one additional point before we look at all of the results for problem 1. When we project into the future, we do so with some degree of uncertainty. Here, the greatest uncertainty lies in our forecast of future volumes. What if our forecast is off by 10 percent? By 25 percent? How will this affect our final results? Click on continue to proceed with this discussion of uncertainty analysis.

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