left-turn channelization tee intersection and back-to-back
TRANSCRIPT
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APPROACH TAPER (SEE CONTRACT)
OPTIONAL DOTTED EXTENSION LINE
NO PASS STRIP ON APPROACH EQUAL TO APPROACH TAPER
ACCELERATION LANE LENGTH
1/2 L STOPPING POINT FOR LEFT-TURN LANE
DECELERATION LANE LENGTH
WIDE LANE LINE
APPROACH TAPER (SEE CONTRACT)
50' B OPTIONAL DOTTED EXTENSION LINE
DOUBLE CENTERLINE (YELLOW) (NARROW PATTERN)
WHITE EDGE LINE
INSIDE RADIUS OF LEFT-TURNING VEHICLE
OPTIONAL NOTES
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DOUBLE CENTERLINE (YELLOW) (NARROW PATTERN)
(OR PAINTED MEDIAN IF LEFT TURNS ARE PROHIBITED)
WHITE EDGE LINE
STOPPING POINT FOR LEFT-TURN LANE
OPTIONAL (SEE CONTRACT)
CENTERLINE STRIPE (SEE NOTES)
INSIDE RADIUS OF LEFT-TURNING VEHICLE
APPROACH TAPER (SEE CONTRACT) VARIES - SEE
CONTRACT PLANS
(SEE CONTRACT)
LEFT-TURN CHANNELIZATION TEE INTERSECTION
WITH ACCELERATION LANE
100'
50'
WIDE LANE LINE
OPTIONAL DOTTED EXTENSION LINE
B
LEFT-TURN CHANNELIZATION TEE INTERSECTION
THIS DIMENSION IS BASED ON A 12' TURN LANE WIDTH
VARIES 47.5'
(SEE CONTRACT)
DOUBLE CENTERLINE (YELLOW) (NARROW PATTERN)
VARIES
(SEE CONTRACT)
LEFT-TURN CHANNELIZATION BACK-TO-BACK LEFT-TURN LANES
WIDE LANE LINE
OPTIONAL DOTTED EXTENSION LINE (BOTH DIRECTIONS)
1. The channelization shown on this plan assumes optimal roadway geometric design. The dimensions may vary to fit existing conditions. See Contract.
2. The channelization shown on this plan is for a two-lane highway. The channelization plan may be used on four-lane undivided highways with the appropriate considerations.
3. Centerline striping on the approach to raised channelization shall be No Pass in accordance with MUTCD figure 3B-15. Centerline striping on the departure from raised channelization shall be determined by an engineering study.
4. Centerline striping on the approach to and departure from painted channelization shall be determined by an engineering study.
5. Centerline striping on four-lane undivided highways shall be a double centerline.
6. The two Type 2L (SL) Traffic Arrows shown in the left-turn storage lane are optional. Arrows may be added for longer storage lanes or deleted for shorter storage lanes. See Contract Plans.
APPROACH TAPER (SEE CONTRACT)
WHITE EDGE LINE
DOUBLE CENTERLINE (YELLOW) (NARROW PATTERN)
POSTED DIMENSION SPEED B
60MPH 60'
55MPH 55'
50MPH 50'
45MPH 45'
40MPH 40'
35MPH 35'
30MPH 30'
25MPH 25'
20MPH 20'
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LEGEND
L = Lane width. See Contract
LT = Left-Turn lane width. See Contract
~ Type 2L (SL) Traffic Arrow
~ Type 6R (SR) Traffic Arrow
CENTERLINE STRIPE (SEE NOTES)
,,;? t ,. / / / Walsh, Brian V ~ {/Jv-<_ Sep 23 2020 I :S7 PM
LEFT-TURN CHANNELIZATION TEE INTERSECTION AND
BACK-TO-BACK TURN LANES STANDARD PLAN M-3.30-04
SHEET 1 OF 1 SHEET
APPROVED FOR PUBLICATION
STATE DESIGN ENGINEER ... VI Washington State Department of Transportation