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Sub-problem 1a - Page 6 of 8

ID# C101A06

Sub-problem 1a: Analysis of the existing TWSC intersection

Step 2. Results

The HCM capacity analysis procedure for TWSC intersections produces the following results for each minor stream movement:

bullet

the capacity of the movement and the capacity of the lane or lanes

bullet

the delay for the movement and the weighted average delay for each lane

bullet

the 95th-percentile queue for each lane

bulletthe level of service for each lane

For the input data that we are considering here, the results are summarized in Exhibit 1-9.

Exhibit 1-9. U.S. 95/Styner Avenue-Lauder Avenue (Dataset1)
Delay, Queue Length, and Level of Service - Existing Volumes

Approach

NB

SB

Westbound

Eastbound

Movement

1

4

7

8

9

10

11

12

Lane configuration

L

L

L

 

TR

L

 

TR

v (vph)

31

59

55

 

205

50

 

155

c (vph)

1,024

1,163

170

 

359

134

 

329

v/c

0.03

0.05

0.32

 

0.57

0.37

 

0.47

95% queue length (vehicles)

0.1

0.2

1.3

 

3.4

1.6

 

2.4

Control delay (sec/veh)

8.6

8.3

36.0

 

27.6

47.0

 

25.3

LOS

A

A

E

 

D

E

 

D

Approach delay (sec/veh)

--

--

29.3

30.6

Approach LOS

--

--

D

D

The table shown above provides a substantial amount of information regarding the forecasted operation of the intersection, including the estimated capacity, v/c ratio, queue length, and delay. What information from the table is most relevant to our analysis?

Discussion:
Take a few minutes to review the data presented in this table. Document what you consider to be some of the key aspects of these results. When you are ready to continue, click the continue button below to proceed.

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