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Subproblem 4d - Page 4 of 4 |
ID# C304D04 |
Sub-problem 4d:
Further Consideration of the Northbound Right Turn
Step 2. Results
Exhibit 3-34 shows the
assumptions and results for the merging analysis. The estimated merge area
density is 17.7 vehicles per mile per lane, indicating LOS B. Based on this
analysis, we would be fairly safe in concluding that the NB right turn will
operate well within its capacity. We can therefore feel comfortable about
eliminating this movement from the TWSC analysis.
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Exhibit 3-34. Merging
Analysis for NBRT Using HCM Chapter 25 |
|
Input Data |
EBT |
NBR |
|
Volume |
2,010 |
433 |
|
Number of lanes |
2 |
1 |
|
Free flow speed |
55 |
35 |
|
Analysis Results |
|
Adjusted flow
rate |
2,010 |
433 |
|
Merge area
density |
17.7 pcpmpl |
|
LOS |
B |
|
Simplifying
Assumptions
No other ramps
present
Driver pop.
adjustment =1.0
PHF =1
10% Trucks and
RVs
Right side entry
1,200 foot
acceleration lane
Level terrain |
We have performed an
exhaustive analysis of TWSC operation in this problem. Several interesting
situations have been explored with respect to the HCM; however, our basic
conclusion about the infeasibility of TWSC as a control mode has not changed.
We will therefore explore the idea of signalization in the next problem of
this case study.
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