SB-TTS Single Lane Closer with Shift Multi Lane Roadway(NOT TO SCALE)
SINGLE-LANE CLOSURE WITH SHIFT
MULTI-LANE ROADWAY
Office of the County Engineer
Planning & Public Works
Pierce County
STANDARD DRAWING PC.K3.2DATE
APPROVED BY:
COUNTY ENGINEER
NOTES:
1)NO FLAGGERS OR SPOTTERS.
2)RECOMMEND EXTENDING DEVICE TAPER (L/3) ACROSS SHOULDER.
3)DEVICES SHALL NOT ENCROACH INTO THE ADJACENT LANE.
4)USE TRANSVERSE DEVICES IN CLOSED LANE EVERY 1000 FEET (RECOMMENDED).
5)DEVICE SPACING FOR THE DOWNSTREAM TAPER SHALL BE 20 FEET, ON CENTER.
6)ALL SIGNS ARE BLACK ON ORANGE.
7)RECOMMEND ADVANCE NOTICE FOR ANY OVER WIDTH LOADS PRIOR TO LANE CLOSURE FOR
ALTERNATE ROUTES IF APPLICABLE.
8)MAINTAIN MINIMUM 11-FOOT LANES AT ALL TIMES.
9)SEE SPECIAL PROVISIONS FOR WORK HOUR RESTRICTIONS.
10)ATTENUATOR REQUIRED WHERE POSTED SPEED LIMIT IS 45 MPH. OTHERWISE, USED AT
CONTRACTOR'S DISCRETION AND EXPENSE.
11)LANE CLOSURES REQUIRE 72-HOUR PUBLIC NOTICE VIA PCMS, UNLESS OTHERWISE APPROVED BY
THE ENGINEER. COORDINATE PCMS MESSAGE WITH PIERCE COUNTY TRAFFIC ENGINEERING.
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TYPICAL SECTION A-A
EXISTING EDGE LINE
EXISTING LANE LINE
CHANNELIZING DEVICE
WORK AREA
A
A
TEMPORARY SIGN LOCATION
CHANNELIZING DEVICES
SEQUENTIAL ARROW SIGN
TRANSPORTABLE ATTENUATOR (NOTE 10)
PORTABLE CHANGEABLE MESSAGE SIGN
1 2
2 SEC 2 SEC
RIGHT
LANE
CLOSURE
1 MILE
AHEAD
FIELD LOCATE 1 MILE IN
ADVANCE OF LANE
CLOSURE SIGNING
ROAD
WORK
AHEAD
W20-1
48 IN. x 48 IN.
TRAFFIC SAFETY DRUM
RIGHT LANE
CLOSED
AHEAD
W20-5R
48 IN. x 48 IN.
W4-2R
48 IN. x 48 IN.
LANE
WIDTH
(FT)
MINIMUM LANE CLOSURE
TAPER LENGTH = L (FT)
25 30 35 40 45
105 150 205 270
115 165 225 295
10
11
POSTED SPEED (MPH)
450
495
125 180 245 32012 540
SHOULDER
WIDTH
(FT)
120
180
USE A 3-DEVICE TAPER FOR SHOULDERS
LESS THAN 8 FEET WIDE
MINIMUM SHOULDER
TAPER LENGTH = L/3 (FT)
25 30 35 40 45
40 40 60 90
40 60 90 90
8
10
POSTED SPEED (MPH)
BUFFER DATA (B, R)
LONGITUDINAL BUFFER SPACE = B
MPH
LENGTH (FT)
25 30 35 40 45
155 200 250 305 360
BUFFER VEHICLE ROLL AHEAD DISTANCE = R
TRANSPORTABLE ATTENUATOR
MINIMUM HOST VEHICLE WEIGHT 15,000 LBS. THE
MAXIMUM WEIGHT SHALL BE IN ACCORDANCE
WITH THE MANUFACTURER'S RECOMMENDATION.
PROTECTIVE VEHICLE
MAY BE A WORK VEHICLE STRATEGICALLY LOCATED
TO SHIELD THE WORK AREA.
30 FEET MIN.
TO
100 FEET MAX.
NO SPECIFIED
DISTANCE
REQUIRED
CHANNELIZATION DEVICE
SPACING (FT)
35 - 45
25 - 30
POSTED
SPEED (MPH)TAPER TANGENT
30 60
20 40
PCMS
EXISTING CENTER LINE
RURAL ROADS, URBAN ARTERIALS,
RESIDENTIAL, AND BUSINESS DISTRICTS
SIGN SPACING = X (1)
(1) ALL SPACING MAY BE ADJUSTED TO ACCOMMODATE
INTERSECTIONS AND DRIVEWAYS.
(2) THIS SPACING MAY BE REDUCED IN URBAN AREAS TO FIT
ROADWAY CONDITIONS.
RURAL ROADS AND URBAN ARTERIALS 35 / 40 MPH 350 ±
200 ± (2)25 / 30 MPH
TYPE OF ROADWAY POSTED SPEED SIGN
SPACING (FT)
RURAL ROADS AND URBAN ARTERIALS 45 MPH 500 ±
TRAFFIC SAFETY DRUM
LEGEND
X X X
L/3
L B R 100 FT.
12 FT. MINIMUM
TRAFFIC SPACE
(11 FT. USABLE
LANE)
EXISTING LANE EXISTING
SHOULDER
4 FT. BUFFER SPACE
2 FT.WORK AREA
SEE NOTE 4
10/17/2022