Sub-problem 1b - Page 5 of 6

ID# C101B05

Sub-problem 1b: Analysis of the Proposed Signalized Intersection

Step 2. Results

When we apply the methods of chapter 16 of the HCM, we obtain estimates of capacity, v/c ratio, queue length, delay, and level of service for each lane group. In addition, capacity, delay, and level of service are produced for each approach. Also, the delay and level of service are produced for the intersection as a whole.

The results from this calculation are summarized in Exhibit 1-11 for the existing volumes and signalized intersection control.

Exhibit 1-11. U.S. 95/Styner-Lauder Avenue (Dataset2) Lane Group Capacity, Control Delay, and LOS Determination - Existing Volumes (Signal Control)
	EB		WB		NB		SB
	LT	TH/RT	LT	TH/RT	LT	TH/RT	LT	TH/RT
Adjusted flow rate	50	155	55	205	31	407	59	557
Lane group capacity	276	438	313	432	491	2,067	569	2,012
v/c ratio	0.18	0.35	0.18	0.47	0.06	0.20	0.10	0.28
95% queue length	1.6	4.8	1.8	6.3	0.6	3.9	1.1	5.4
Green ratio	0.25	0.25	0.25	0.25	0.58	0.58	0.58	0.58
Control delay	19.0	20.7	18.9	22.9	5.7	6.1	5.9	6.6
Lane group LOS	B	C	B	C	A	A	A	A
Approach delay	20.3		22.0		6.1		6.5
Approach LOS	C		C		A		A
Intersection delay	10.9		Intersection LOS				B
Critical v/c ratio	0.34

Discussion:
Take a few moments to reflect on the analysis results presented in this table and consider the performance measures most relevant to an assessment of the overall operational characteristics of the signalized intersection. Click on continue when you are ready to proceed.

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