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Sub-problem 2c - Page 5 of 7 |
ID# C402C05 |
Sub-problem 2c: What
is the level of service at the ramp junction at the northbound on-ramp to
I-87?
The data produced from the HCM analysis of the merge point
located at northbound I-87 and the on-ramp from Alternate Route 7 westbound are
shown in Exhibit 4-31.
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Exhibit 4-31. Results of HCM
Analysis on Merge |
| Output data |
AM Peak |
PM Peak |
|
Dataset 17 |
Dataset 18 |
| PFM |
0.59 |
0.59 |
| V12, pc/h |
656 |
3,154 |
| VFO actual, pc/h |
1,957 |
7,444 |
| VFO maximum, pc/h |
6,750 |
6,750 |
| VR12 actual, pc/h |
1,504 |
5,265 |
| VR12 maximum, pc/h |
4,600 |
4,600 |
| Density, pc/mi/lane |
13.7 |
42.4 |
| LOS for ramp-freeway junction area of
influence |
B |
F |
| Speed-ramp influence area, mph |
51.2 |
41.6 |
| Speed-outer lanes, mph |
55.0 |
49.0 |
| Speed-all vehicles, mph |
52.0 |
43.5 |
Carefully study the information
presented in the table. Using this information, consider the following
questions:
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What is the significance of the parameter, PFM? |
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Which data from the table above describe the nature of
the flow of traffic in the merge influence
area? |
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What is the basis for the forecast of level of service? |
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How would you describe the operation of the merge point
in the PM peak period? |
Discussion:
 Take a few minutes to consider
these questions. When you are ready, continue to the next page.
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Continue ] with Sub-Problem 2c |
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