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Sub-problem 6a - Page 1 of 2

ID# C106A01

Sub-problem 6a: Planning Analysis at Palouse River Drive

The Idaho Transportation Department has provided historic traffic volume data for U.S. 95 to help determine a historic growth rate. This data suggests an annual growth rate of 3.4 percent per year over the past 20 years, and 2.6 percent over the past 10 years.

The City of Moscow has provided planning model volumes that project 20-year traffic growth on the U.S. 95 corridor to be 50 percent over the next twenty years. Based on this information, what is the number of lanes required for the intersections along the U.S. 95 corridor in twenty years, assuming an annual traffic growth rate along the corridor of two percent?

In sub-problem 6a, we will use the planning analysis technique to evaluate conditions that occur when traffic is leaving a football game at the University of Idaho. Demand is high for about an hour after the conclusion of the game and the U.S. 95 corridor experiences a high level of congestion during this period.

Consider the following:


If left-turn treatments are unknown, how should they be treated?


How should lanes with shared through/left-turns be handled?


Will a planning analysis allow complex lane configurations?


Should right turns be considered a separate movement or combined with through movements?

bulletWhat is the accuracy of the data used at the planning level? What does this suggest about the results?

Take a few minutes to consider these questions. When you are ready, continue to the next page.

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