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Problem 2 - Page 2 of 3

ID# C202002

Problem 2: Moe Road

The signal phasing is shown in Exhibit 2-22. There are three phases: 1) westbound protected left; 2) east-west green with permitted lefts; and 3) north-south green with permitted lefts.

Exhibit 2-23 shows some signal timing data collected on a recent weekday morning. Variations in the platoon arrivals on the eastbound and westbound approaches make the cycle length fluctuate significantly. Also, as the data show, the first phase is skipped if neither the eastbound or westbound left-turn lane is occupied. Lefts that arrive during Phase 2 can turn permissively.

Exhibit 2-23. Moe Road/Route 146
Intersection Timing Data for the AM Peak Hour

Cycle

Phase 1

Phase 2

Phase 3

Cycle Length

1

9-3-1

38-3-1

20-3-1

79

2

-

30-3-1

31-3-1

69

3

7-3-1

50-3-1

33-3-1

102

4

-

50-3-1

29-3-1

87

5

12-3-1

19-3-1

34-3-1

77

6

8-3-1

49-3-1

35-3-1

104

*The time read as Green-Yellow-Red
Data Collection Date: Friday - 6/21/2002

Analysis Plans: Description of Analyses

Sub-problem 2a: AM Peak Hour - Existing Conditions

Sub-problem 2b: PM Peak Hour - With Conditions

Discussion

Discussion:
Look at the photographs of Moe Road shown on the previous page. Are there other pieces of information about the site that should have been factored into our characterization of the intersection? Consider intersections that you have analyzed and ask why pictures are so valuable and why visits to the facility are important in doing the analysis correctly.

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