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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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