1 Channelization and Turn Bays CE 453 Lecture 31.
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Transcript of 1 Channelization and Turn Bays CE 453 Lecture 31.
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Channelization and Turn Bays
CE 453 Lecture 31
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Outline
Principles of Channelization Turn Bay Design Median Openings Some Examples Around Ames
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Principles of Channelization
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Channelization purpose:
Facilitate safe and orderly movement Separate or regulate conflicting
movements Define paths of travel Use traffic islands or pavement
markings … for both vehicles and pedestrians
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Types/functions
Directional – control, direct, guideDivisional – divide and alert Refuge – aid and protect pedestrians
and bicyclists
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Island Channelization
Flush or raised, paved or unpaved, always marked, sometimes delineated
If raised … use lighting If raised rural … also delineate and slope
curbs Size: large enough to command attention Must delineate a path that is natural and
convenient for the driver
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Island Channelization
Must have sufficient approach sight distance to islands
Right turn island size (75 square feet at least to command attention)
Minimum length of left turn bay 100’ If used at series of rural intersections,
keep geometry consistent
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Channelization
Gives priority to dominant movements Provides storage and/or deceleration area
for turning vehicles Controls prohibited turns Restricts speed
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Delineation With Pavement Marking
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Usage expected in Iowa???
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Functional Objectives
Limit Conflict Points (i.e., prohibit certain movements, non-overlap of opposing LTs), esp. in vicinity of intersection functional area (see figures)
Limit Conflict Area Complexity (i.e., eliminate legs, add turn lanes, islands)
Limit Conflict Frequency (i.e., add turn lanes, use right angles)
Limit Conflict Severity (i.e., small angles, adequate turn bay length/curb radii for speed differential issues)
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Points of Conflict
Traffic conflicts occur where the path of traffic movement crosses.
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Urban Intersection
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Conflict Points at Intersection
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Urban Channelized Intersection-
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Left & Right Turn Lanes
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Left & Right Turn Lane Requirements
Turning movement volumes/ capacity Length of vehicles
Accident (crash) experience (MUTCD? Other?)
Source: www\fhwa\Flexibility in Highway Design - Chapter 8 - FHWA.htm
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New Construction: all unstopped approaches on primary, high speed rural highway
intersections with other primary roadways Other approaches where through, left, and opposing volumes
justify 12 ft. lanes
Left Turn Lane Warrants – Iowa DOT
Rehabilitation: Typically installed where
there is a safety issue with vehicles turning left
11 ft. or 12 ft. lanes
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Warrants (cont.)
Consider left turn lane if advancing volume/percent left combination exceeds these values.
Note: for advancing left turn volume > 300 VPH total, consider dual left turn lane.
Source: Green book 2001
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40mph
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50mph
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Warrants (cont.) – SUDAS?
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Lane Length
Deceleration Provide distance for turning vehicles to decelerate without
interfering with through traffic Deceleration lane length depends on:
Speed number of queued vehicles vehicle length
Minimum: accommodate deceleration from D.S. – 10 mph to stop (PRT & 10 MPH reduction occurs upstream of bay; more in congested, urban conditions)
Storage Unsignalized, accommodate 2 minutes of demand, at least 2
cars (or 1 car and 1 truck if truck% > 10)
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Length required, unsignalized left turn lanes
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Turn Bay Components
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Some Turn Lane Details
Transitions are often symmetrical reverse curves or straight line
Curves at each end are desirable Green Book: 8:1 to 15:1 tapers for high
speed highways … urban use 100’ for single and 150’ for dual left turn lane
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Design
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Design
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Left Turn Bay Circular Transition
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Left Turn Bay Taper
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Left Turn Bay (No Transition)
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Left Turn Separated [Tiger Tail]
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If speed limit = 45Initial v = 35 = 50fpsd2=10:1 x 12 = 120’Delta v = ?120=1/2(4.5)t2 + 50tt=2.2sDelta v = 2.2x4.5=10fpsv2=50-10=40fpst2=40/9=4.5sd3=1/2(9)(4.5)2 = 92’~100’d3+d3=220’ for decel. Only(within the lane only)
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With Signals …
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Signalized storage required:
Signalized, accommodate twice the expected average storage needed – depends on cycle and phasing
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Right Turn Bays
Right turn bay length depends on corner radius (design speed)
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Median Openings
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Raised Median: Clive
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T-Intersection or Driveway
Side Street
Two Lane Undivided Street
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T-Intersection or Driveway
Side Street
Two Lane Undivided Street
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Median Closure
Application – Median openings should be considered for closure when:
A safety or operational problem is evident and an appropriate retrofit cannot be made.
Median width <11 ft. The left-turn bay of a nearby signalized intersection
needs to be extended. Where a pattern of left-turn crashes is evident. Where heavy pedestrian use is predicted or accidents
involving pedestrians have occurred at intersections.
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Median Closure - Design
The need for visual cues is especially critical during nighttime hours where a 4-way intersection previously existed or there are access drives directly opposite each other.
Minimum 4 ft. width face-to-face of curbs is recommended.
Select and locate landscaping materials to delineate the median.
Landscaping must not obscure sight distances.
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T-Intersection or Driveway
Two lane roadway with raised median closed, no left-turn
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T-Intersection or DrivewayAfter #2Two-lane roadway with raised median (left turn egress only from intersection or
driveway)
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T-Intersection or DrivewayAfter #3
Two lane roadway with raised median (left turn ingress only into driveway)
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4-Way Intersection or Driveway
Note: Add 4 conflicts to each for four lane roadways
40 conflicts with Four Lane on major street
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4-Way Intersection or Driveway
Added median close eliminates left-turn conflicts
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4-Way Intersection or Driveway
Two lane roadway with raised median (left turn egress only from intersection or driveway)
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4-Way Intersection or Driveway
Two lane roadway with raised median (left turn ingress only into intersection or driveway)
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Two Way Left Turn Lanes at Intersection or Driveway:
Two way left turn lanes (TWLTL) (3 lane roadway)
Reduces rear-end accidents and allows merging traffic to store in TWLTL
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Openings in the Raised Median
New median openings should not be permitted except to accommodate intersecting public roads or streets or large traffic-generating facilities such as shopping centers or industrial plants.
Median openings may be permitted in these instances if satisfactorily justified and in the public interest.
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Median Openings …(see GB for Design specs)
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Island for No Left Turn
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Some examples around Ames
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Striping through Intersection: Difficult to See
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Curb Radius Parking Lot
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Island for No Left Turn
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Right Turn Bay Curve
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Left Turn Bay Pavement Markings
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Curb Radius Curb Cut
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Turn Lane Pedestrian Refuge
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Curb Cut
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RR Crossing
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RR Crossing Raised Median
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Right Turn Island
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Island Pedestrian Refuge
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Median End Treatment
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Left Turn Bay Curve, Right Turn Bay Taper
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Left Turn Bay Circular Transition
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Left Turn Bay Curve, Right Turn Bay Taper
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Median to Discourage U-Turns
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3 Leg Intersection
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Median End (Keep Right)
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Median End Delineation
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Median in front of Lowes
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Intersection Approach Lincoln Way at Elwood
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Intersection Approach 4th at Lincoln Way
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Median: Elwood Dr. at Airport Rd.