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 the table below.
| Output data | AM Peak | PM Peak |
| 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.