Sub-problem 1b - Page 3 of 4

ID# C501B03

Sub-problem 1b: Analysis of the Signalized Intersection with Projected Traffic

Step 2: Results

A comparison of operations between a TWSC and a signal controlled intersection with existing traffic and geometry would be informative, and would also provide some data for further comparisons later. The results, including queue, delay, and LOS (assuming an actuated signal running an average 120-second cycle) are shown in Exhibit 5-15:

Exhibit 5-15. Existing Museum at Reitz comparing TWSC with Actuated Signal Control
	EB			WB			NB			SB
	L	T	R	L	T	R	L	T	R	L	T	R
Queue w/TWSC	0.7	0.0	0.0	0.0	0.0	0.0	4.1	0.0	4.1	8.6	0.0	7.3
Queue w/Signal	4.9	28.4	28.4	0.0	27.7	27.7	1.0	0.0	1.0	3.2	0.0	8.5
Delay w/TWSC	12.5	0.0	0.0	0.0	0.0	0.0	999	0.0	999	999	0.0	123.5
Delay w/Signal	14.9	17.4	17.4	0.0	17.4	17.4	27.2	0.0	27.2	28.5	0.0	32.4
LOS w/TWSC	B	A	A	-	A	A	F	-	F	F	-	F
LOS w/Signal	B	B	B	-	B	B	C	-	C	C	-	C

We can also perform a signalized intersection analysis using projected traffic under the same actuated control parameters. A similar comparison between TWSC and signal control for future conditions is presented in Exhibit 5-16:

Exhibit 5-16. Projected Museum at Reitz considering Actuated Signal Control
	EB			WB			NB			SB
	L	T	R	L	T	R	L	T	R	L	T	R
Queue TWSC	6.7	0.0	0.0	0.0	0.0	0.0	4.1	0.0	4.1	29.1	0.0	50.1
Queue Signal	64.1	29.7	29.7	0.0	40.4	40.4	1.0	0.0	1.0	12.5	0.0	64.3
Delay TWSC	30.4	0.0	0.0	0.0	0.0	0.0	999	0.0	999	999	0.0	999
Delay Signal	584.6	17.8	17.8	0.0	24.6	24.6	27.3	0.0	27.3	35.5	0.0	311.4
LOS TWSC	D	A	A	-	A	A	F	-	F	F	-	F
LOS Signal	F	B	B	-	C	C	C	-	C	D	-	F

The results here show the delay changed from the stop controlled approaches to the eastbound left turn and the southbound right turn, because of the significant demand on these approaches result in delays even with a traffic signal at this location.

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