Sub-problem 4b - Page 3 of 3

Let's first consider the level of service for the facility, or, more correctly, for each section of the facility that makes up this analysis. We need to note that, using this method, there is no overall performance measure for the facility as a whole. Part 3 of the HCM does cover issues relating to corridor and area-wide analysis. But we will not cover them here. If you are interested in learning more about this topic, consult part 3 of the HCM.

The level of service for each section is shown in the table below. Each of the sections performs at level of service C or better, with the exception of section 2, the weaving section. This result is consistent with our analysis produced in Problem 2 where we identified deficiencies with this weaving section during the peak period. We also noted that, while speeds in other sections are nearly 50 mph or above, section 2 has a forecasted speed below 28 mph, indicating a problem in the performance of the weaving section.

We can also note that the demand/capacity ratio is near one for this section. What is the implication of a demand/capacity ratio that is this high?

SECTION TITLE (EB Section)	S01	S02	S03	S04	S05	S06	S07	S08	S09	S10	S11
Type (B,W, ONR,OFR)	B	W	B	ONR	B	B	OFR	B	ONR	ONR	B
Length (ft)	3,675	670	1,025	775	1,890	10,900	1,500	3,100	1,115	1,500	2,000
Number of lanes	2	4	2	4	3	2	2	2	2	4	4
Free flow speed (mph)	55	55	55	55	55	55	55	55	55	55	55
Speed (mph)	55.0	27.9	48.1	53.4	54.8	55.0	49.9	54.9	50.8	54.5	55.0
Density (veh/mi/ln)	10.0	35.3	7.6	10.8	14.4	21.6	21.8	13.7	17.8	15.0	14.8
Segment Capacity (vph)	4,375	4,100	4,375	8,750	6,565	4,375	4,375	4,375	4,375	8,750	8,750
Segment Demand (vph)	1,095	3,930	895	2,540	2,540	2,540	2,540	1,610	1,890	3,365	3,365
Segment Volume (vph)	1,095	3,195	730	2,370	2,370	2,370	2,370	1,505	1,785	3,260	3,260
d/c ratio	0.25	0.96	0.20	0.29	0.39	0.58	0.58	0.37	0.43	0.38	0.38
v/c ratio	0.25	0.78	0.17	0.27	0.36	0.54	0.54	0.34	0.41	0.37	0.37
Vehicle LOS	B	E	A	B	B	C	C	B	B	B	B