Home > Problem 4 > Sub-problem 4d - Page 4 of 4

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.

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 feasibility 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.

[ Back ] [ Continue ] to Problem 5