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## Highway Capacity Analysis of Multilane Uninterrupted Flow Facilities Chapter 10

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### conditions deteriorate shortly thereafter. LOS Criteria: Density in pc/mi/l ... N: # of lanes in one direction. fw: lane width adj. factor (Table 12.3) ... – PowerPoint PPT presentation

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Title: Highway Capacity Analysis of Multilane Uninterrupted Flow Facilities Chapter 10

1
• Highway Capacity Analysis of Multilane
Uninterrupted Flow Facilities (Chapter 10)
• Three types of segments
• Basic
• Ramp Junctions
• weaving sections
• Basic Section Uninterrupted
• 1994 HCM 2000pcphpl for 70 mph design speed

2
• 1900 pcphpl for 50 mph design speed
• v/c up to 0.75?speed is fairly high
• conditions deteriorate shortly thereafter
• LOS Criteria Density in pc/mi/l
• LOS A 12, B 20, C30, D42, E67, Fgt67
• Avg. Spacing 5280/density

3
• LOS Average Spacing
• A 440 feet
• B 264 feet
• C 176 feet
• D 126 feet
• E 79 feet ( 4 car length)
• Rule of thumb 1 car for every 10 mph speed

4
• Going at 60 mph, need average spacing of (6)(20)
120 feet
• Corresponding density 44 pcpmpl
• F(D)(S)(44)(60) 2640 pcphpl
• 94 HCM also give LOS in terms of v/c ratios
• Table 12-1 in old text for LOS A the v/c is
0.29 at Free Flow Speed of 70 MPH

5
• For LOS E, v/c1.0
• MSF2,000(v/c)
• Values are applied to peak 15 minute flows
• SFi (MSFi)(N)(fw) (fp) (fHV)
• MSF for LOS I (Table 12.1)
• N of lanes in one direction
• fw lane width adj. factor (Table 12.3)

6
• fp Driver Population (Table 12-4)
• fHVHeavy Vehicles factor
• Full Hour Service Volume SVi (SFi)(PHF)
• Operational Analysis
• v/c(SF)/(c )(N) (fw) (fp) (fHV)
• v/c(SV)/(PHF)(c )(N) (fw) (fp) (fHV)
• Enter table 12.1 to get LOS

7
• Design Analysis
• N(DDHV)/(PHF)(c )(v/c)i (fw) (fp) (fHV)
• Calculated N should be integer
• Heavy Vehicles Factor
• Extended Segments
• Level, Rolling, and Mountain.
• Table 12-5
• Specific Grades

8
• Special Treatment for
• Grades gt 1mile ? 3
• Grades gt 1/2 mile gt 3
• Factors Truck type, grade length, grade, and
truck
• Tables 12-6 to 12-10
• Composite Grade

9
• If x1,x2 gt 3000 feet
• or G1,G2 gt 3, apply the HCM Method
• 2 of 5,000 ft 6 of 5,000ft 6 of 1,000 ft

10
• Downgrades
• Llt 4,000 ft Glt 4 , ET Level
• Lgt 4,000 ft Ggt 4 , ET 0.50ET for upgrade
• Climbing Lanes on Freeways
• Equal v/c for both regular and truck
lanes?CT(2,400)/(ET)
• SFTCT(v/c)i
• CT(v/c)i ?climbing and mixed freeway lanes

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