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Sub-problem 2b - Page 2 of 3

ID# C502B02

Sub-problem 2b: Analyzing the Effects of Signal Phasing

Step 2: Results

Referring once again to the results of our initial analysis (see Exhibit 5-23), we see that there may be an opportunity to combine improvements through phasing design, since the two most deficient movements are the eastbound left and the southbound right. This allows us to introduce a phase that implements a leading protected left-turn phase eastbound that can run concurrently with a protected right-turn phase southbound as shown here:

Phase1 Phase2 Phase3
G = 10 sec G = 48 sec G = 12 sec
Y = 4 sec Y = 4 sec Y = 4 sec
R = 1 sec R = 1 sec R = 1 sec

This phasing provides more protected time to the most deficient movements to improve the overall efficiency of the intersection, as illustrated in the results below: 

Exhibit 5-25. Museum Road at Reitz Union Drive (Leading EB Left)

 

EB

WB

SB

L

T

R

L

T

R

L

T

R

Volumes

380

670

-

-

595

180

205

-

485

Queues (veh)

11

19

-

-

34

34

15

-

17

Delay

21

6

-

-

17

17

55

-

38

LOS

C

A

-

-

B

B

E

-

D

Intersection

Delay

22.0

LOS

C

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