SB-TT5 ONE LANE(NOT TO SCALE)
ONE LANE, TWO-WAY TRAFFIC
CONTROL WITH FLAGGERS
Office of the County Engineer
Planning & Public Works
Pierce County
STANDARD DRAWING PC.K4.1DATE
APPROVED BY:
COUNTY ENGINEER
41224
ST AT E O F WASHIN
G
T
O
N
P
R
O
F
E
SSIONAL E N G I N E ER
REGI STE R E D
ME LI S S A C . McF
A
D
D
E
N
X
X
X
X
ROAD
WORK
AHEAD
BE
PREPARED
TO STOP
ONE LANE
ROAD
AHEAD
ROAD
WORK
AHEAD
ONE LANE
ROAD
AHEAD
BE
PREPARED
TO STOP
R B X X X X
XXX
ROAD
WORK
AHEAD
ONE LANE
ROAD
AHEAD
BE
PREPARED
TO STOP
X
WORK
AREA
FLAGGING STATION
TEMPORARY SIGN LOCATION
CHANNELIZING DEVICES
PROTECTIVE VEHICLE (SEE NOTE 7)
NOTES:
1) ALL SIGNS ARE BLACK ON ORANGE.
2) EXTEND DEVICE TAPER AT L/3 ACROSS SHOULDER, 3 DEVICES MINIMUM.
3) IF A SIGNAL IS PRESENT, IT SHALL BE SET TO "RED FLASH MODE"
DURING FLAGGING OPERATIONS.
4) NIGHT WORK REQUIRES ADDITIONAL ROADWAY LIGHTING AT FLAGGING
STATIONS. SEE THE STANDARD SPECIFICATIONS FOR ADDITIONAL DETAILS.
5) MAINTAIN MINIMUM 11-FOOT LANES AT ALL TIMES.
6) SEE SPECIAL PROVISIONS FOR WORK HOUR RESTRICTIONS.
7) PROTECTIVE VEHICLE REQUIRED WHERE POSTED SPEED LIMIT IS 45 MPH.
OTHERWISE, USED AT CONTRACTOR'S DISCRETION AND EXPENSE.
8) LANE CLOSURES REQUIRE 72-HOUR PUBLIC NOTICE VIA PCMS, UNLESS
OTHERWISE APPROVED BY THE ENGINEER. COORDINATE PCMS MESSAGE
WITH PIERCE COUNTY TRAFFIC ENGINEERING.
50 TO
300 FT.
50 TO 100 FT.
6-DEVICE
MIN.
50 TO 100 FT.
6-DEVICE
MIN.
W20-1
48 IN. x 48 IN.W20-4
48 IN. x 48 IN.
W20-7A
48 IN. x 48 IN.
W20-7B
48 IN. x 48 IN.
(OPTIONAL IF 40
MPH OR LESS)
W20-7B
48 IN. x 48 IN.
(OPTIONAL IF 40
MPH OR LESS)
W20-1
48 IN. x 48 IN.
W20-7A
48 IN. x 48 IN.
W20-7B
48 IN. x 48 IN.
(OPTIONAL IF 40
MPH OR LESS)
W20-1
48 IN. x 48 IN.
W20-4
48 IN. x 48 IN.
W20-4
48 IN. x 48 IN.
W20-7A
48 IN. x 48 IN.
LEGEND
CHANNELIZATION DEVICE
SPACING (FT)
35 - 45
25 - 30
POSTED
SPEED (MPH)TAPER TANGENT
30 60
20 40
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
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 ±
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
10/17/2022
Berry Valley Rd. SE