8/10/2019 Topic 6 - Uninterrupted Facilities
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Topic 6Topic 6Uninterrupted FacilitiesUninterrupted Facilities
(Chapter 9)(Chapter 9)
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Traffic FacilitiesTraffic Facilities
Uninterrupted FacilitiesUninterrupted Facilities TwoTwo--lane highwayslane highways
MultiMulti--lane highwayslane highways
Expressways and FreewaysExpressways and Freeways
Interrupted FacilitiesInterrupted Facilities IntersectionsIntersections
ArterialsArterials
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Uninterrupted FacilitiesUninterrupted Facilities
Multilane HighwaysMultilane Highways Speed limits: 40 ~ 55 mphSpeed limits: 40 ~ 55 mph
Traffic volume range: 15,000 to 40,000 per dayTraffic volume range: 15,000 to 40,000 per day
Partial access controlPartial access control
Divided or undividedDivided or undivided
FreewaysFreeways Speed limits: 60 ~ 75 mphSpeed limits: 60 ~ 75 mph
FullFull--access control (except freeway ramps)access control (except freeway ramps)
Divided with medianDivided with median
Minimum two lane each directionMinimum two lane each direction
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Freeway FacilitiesFreeway Facilities
Freeway segmentsFreeway segments
Basic
Off-ramp
On-ramp
Weaving
Basic
Basic
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Basic Sections: LOSBasic Sections: LOS(HCM Chapter 23)(HCM Chapter 23)
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Prevailing ConditionsPrevailing Conditions
12 ft lane12 ft lane
Lateral clearance is 6 ft or greaterLateral clearance is 6 ft or greater
Passenger car onlyPassenger car only
Interchange spacing is at least 2 miles apart (0.5Interchange spacing is at least 2 miles apart (0.5interchange per mile)interchange per mile)
Five lanes each direction for urban freewayFive lanes each direction for urban freeway Grades do no exceed 2 percentGrades do no exceed 2 percent
Commuter driversCommuter drivers
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
LOS ProcedureLOS Procedure
Step 1: Determine FreeStep 1: Determine Free--flow Speed (FFS)flow Speed (FFS)
Step 2: Determine volume (pc/Step 2: Determine volume (pc/h/lnh/ln))
Step 3: Calculate density,Step 3: Calculate density, kk
Step 4: Determine LOS (Table 9.33)Step 4: Determine LOS (Table 9.33)
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
LOS ProcedureLOS Procedure
Step 1: Determine FreeStep 1: Determine Free--flow Speed (FFS)flow Speed (FFS)
IDNLCLWf ffffBFFSuFFS ==
BFFSBFFS 70 (urban), 75 (rural)70 (urban), 75 (rural)ffLWLW (Table 9.34)(Table 9.34)
ffLCLC (Table 9.35)(Table 9.35)
ffNN (Table 9.36)(Table 9.36)
ffIDID (Table 9.37)(Table 9.37)
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Example 9.13Example 9.13
NN = 3;= 3;
LWLW = 11 ft;= 11 ft;
LCLC = 3 ft;= 3 ft;
IDID = 1.5 per mile= 1.5 per mile
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
LOS ProcedureLOS Procedure
Step 2: Determine volume (pc/Step 2: Determine volume (pc/h/lnh/ln))
))()()(( HVpp
ffNPHFqq =
ffpp 0.85 ~ 1.00, 1.00 for commuter traffic0.85 ~ 1.00, 1.00 for commuter traffic
EETT,, EERR (Tables 9.25, 9.26, 9.27, 9.28)(Tables 9.25, 9.26, 9.27, 9.28)
)1()1(11
++
=
RRTT
HVEPEP
f
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
EETT and Eand ERR Based onBased on
Types of Freeway SegmentsTypes of Freeway Segments
Extended Segments (Table 9.25)Extended Segments (Table 9.25) GradesGrades 3% but less than3% but less than mile, ormile, or
GradesGrades < 3% and less than< 3% and less than milemile
Segments with Specific GradesSegments with Specific Grades
(Tables 9.26 and 9.27)(Tables 9.26 and 9.27) Segments with Specific Downgrades (Table 9.28)Segments with Specific Downgrades (Table 9.28)
Composite GradeComposite Grade Two or more consecutive upgradesTwo or more consecutive upgrades
Grades < 4% or length < 4000 ft (average technique)Grades < 4% or length < 4000 ft (average technique)
Otherwise, use truck performance curvesOtherwise, use truck performance curves
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Example 9.11Example 9.11
Grade: 3%Grade: 3% -- 2000 ft; 2%2000 ft; 2% -- 1500 ft1500 ft;;
PPTT
= 6%;= 6%;
PPRR = 10%;= 10%;
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
LOS ProcedureLOS Procedure
Step 3: Calculate density,Step 3: Calculate density, kk
f
p
u
qk =
Step 4: Determine LOS (Table 9.33)Step 4: Determine LOS (Table 9.33)
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
Example 9.15Example 9.15
qq = 3000= 3000 vphvph;;PHF = 0.85;PHF = 0.85;
Trucks = 12%Trucks = 12%LWLW = 11 ft;= 11 ft;LCLC = 6 ft;= 6 ft;IDID = 1 per mile= 1 per mile
Terrain = levelTerrain = levelffpp = 1.0= 1.0
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CEE 362CEE 362 Spring 2006Spring 2006 Instructor: Zong TianInstructor: Zong Tian
ApplicationsApplications
Determine LOS, givenDetermine LOS, given qq,, NN, and, and FFSFFS
Determine Speed, givenDetermine Speed, given qq,, LOSLOS, and, and FFSFFS
Determine q, givenDetermine q, given LOSLOS, and, and FFSFFS
Determine N, givenDetermine N, given qq,, FFSFFS, and, and LOSLOS
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