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:

	the capacity of the movement and the capacity of the lane or lanes
	the delay for the movement and the weighted average delay for each lane
	the 95^th-percentile queue for each lane
	the 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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