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Sub-problem 2d - Page 3 of 7 |
ID# C402D03 |
Sub-problem 2d: How
Can We Improve the Level of Service at the Ramp Junction at the Northbound On-Ramp to
I-87?
Step 2. Results
Exhibits 4-32 and 4-33 show the impact of adding a lane to the
freeway mainline. Exhibit 4-32 shows the input data while Exhibit 4-33 shows the output data produced from the HCM analysis.
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Exhibit 4-32.
Additional Lane on Freeway Mainline Input Data |
| Freeway data |
AM Peak |
PM Peak |
|
Dataset 19 |
Dataset 20 |
| Number of lanes, N |
4 |
| Free flow speed, SFF |
55 |
| Volume |
1,000 |
4,800 |
| Ramp data |
AM Peak |
PM Peak |
| Ramp volume |
765 |
1,900 |
| Number of lanes on-ramp, N |
1 |
| Length of acceleration lane, LA |
500 |
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Exhibit 4-33.
Additional Lane on Freeway Mainline Output Data |
| Output data |
AM Peak |
PM Peak |
| PFM |
0.24 |
0.08 |
| V12, pc/h |
261 |
415 |
| VFO actual |
1,957 |
7,444 |
| VFO maximum |
9,000 |
9,000 |
| VR12 actual |
1,109 |
2,526 |
| VR12 maximum |
4,600 |
4,600 |
| Density, pc/mi/lane |
10.6 |
21.1 |
| LOS for ramp-freeway junction area of
influence |
B |
C |
| Speed-ramp influence area, mph |
51.3 |
50.8 |
| Speed-outer lanes, mph |
55.0 |
47.5 |
| Speed-all vehicles, mph |
52.8 |
48.6 |
After reviewing the output data shown in
Exhibit 4-33,
consider the following questions:
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What is the most significant change in the performance
of the merge area as a result of the addition of the lane to the freeway
mainline? |
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Does the addition of the lane produce acceptable
performance of the merge area? |
Discussion:
 Take a few minutes to consider
these questions. When you are ready, continue to the next page.
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