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Subproblem 4c - Page 3 of 3

ID# C304C03

Sub-problem 4c: Separating the Conflict Points for TWSC Control

One more observation may be made from Exhibit 3-31. The NB right turn, even with the conflict points separated, indicates an oversaturated condition when analyzed as a TWSC operation. Because of the geometrics, the right-turn entry has more of the characteristics of a merge than a stop-controlled approach. This should raise some question as to whether another analysis procedure might be more appropriate. The treatment as a freeway entrance ramp will be considered in the next sub-problem.

Exhibit 3-31. TWSC Analysis with Conflict Points Separated

Input Data

EBT

WBT

NBL

WBL

NBR

Volume

2,010

358

257

120

433

Number of lanes

2

2

1

1

1

Percent trucks

 

 

20

41

10

NB Left vs EB Through

Sub-problem 4b Capacity

 

 

69

 

 

Sub-problem 4c Capacity

---

---

99

---

 

95% queue length (veh)

---

---

24

---

 

Queue storage (veh)

---

---

N/A

---

 

Is storage adequate?

---

---

N/A

---

 

v/c ratio

---

---

2.6

---

 

Delay

---

---

814

---

 

LOS

---

---

F

---

 

NB Left vs WB Through and Left

Sub-problem 4b Capacity

 

 

N/A

 

 

Sub-problem 4c Capacity

---

---

559

---

 

95% queue length (veh)

---

---

2.4

---

 

Queue storage (veh)

---

---

4

---

 

Is storage adequate?

---

---

Yes

---

 

v/c ratio

---

---

0.46

---

 

Delay

---

---

17

---

 

LOS

---

---

C

---

 

WB Left vs EB Through

Sub-problem 4b Capacity

 

 

 

168

 

Sub-problem 4c Capacity

---

---

---

213

 

95% queue length (veh)

---

---

---

2.07

 

Queue storage (veh)

 

---

---

3.06

 

Is storage adequate?

 

---

---

Yes

 

v/c ratio

---

---

---

0.56

 

Delay

---

---

---

41.7

 

LOS

---

---

---

E

 

NB Right vs EB Through

Sub-problem 4b Capacity

 

 

 

 

226

Sub-problem 4c Capacity

 

 

 

 

283

95% queue length (veh)

 

 

 

 

25

Queue storage (veh)

 

 

 

 

N/A

Is storage adequate?

 

 

 

 

N/A

v/c ratio

 

 

 

 

1.53

Delay

 

 

 

 

288

LOS

 

 

 

 

F

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