AaronGreenTC420FILE NAME
TIME
DATE
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.REVISION DATE BY
SHEET
OF
SHEETS
Washington State
Department of Transportation
P.E. STAMP BOX P.E. STAMP BOX
DATE DATE
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH
PLOTTED BY
PLAN REF NO
LintzF
4/2/2024
2:05:04 PM
C:\Users\LintzF\OneDrive - Washington State Department of Transportation\Desktop\Work Zone TCPs\420Hwy40-AltTrafficFlagger.dgn
10
Plot 1
NOT TO SCALE
X X X X 50' - 300'
XXXXBR
WORK AREA
SECTION A-A
SHOULDER
EXISTING
LANE
EXISTING
LANE
EXISTING
SHOULDER
EXISTING
6
+
D
E
V
IC
E
S
5
0
'
-
1
0
0
'
T
A
P
E
R
6
+
D
E
V
IC
E
S
5
0
'
-
1
0
0
'
T
A
P
E
R
FLAGGER
PROTECTIVE VEHICLE (SEE NOTE 2)
OPTIONAL CHANNELIZATION DEVICE
)SEE NOTE 328" REFLECTIVE TRAFFIC CONE (
TEMPORARY SIGN LOCATION
:LEGEND
SEE NOTE 3
24"
STOP
SLOW
(W/R, B/O)
W21-1201
PROTECTIVE VEHICLE ROLL AHEAD DISTANCE = R
RECOMMENDED. 40' - 80'
STRATEGICALLY POSITION WORK VEHICLE TO PROTECT WORK CREW.
SEE TC420, SHEET 2.
AND INTERSECTING ROADWAY DETAILS:
FOR DRIVEWAY, BUSINESS ACCESS,
P
V
P
V
(OTHERWISE, USE PILOT CAR OPERATION)
SEE NOTE 4
TO ALT. TRAFFIC
10' MIN LANE OPEN
24"24"
W21-1201 (W/R, B/O)
STOP SLOW
TYPICAL TRAFFIC CONTROL PLANS
TC420
1
4
W20-7A
MIN 36"
MIN 36"
OR LESS
IF 40 MPH
OPTIONAL
W20-7B
MIN 36"
MIN 36"
W20-4
MIN 36"
MIN 36"
ROAD
AHEAD
ONE LANE
W20-1
MIN 36"
MIN 36"
S
E
E
N
O
T
E
S
1
&
2
(
O
P
T
IO
N
A
L
)
W20-1
MIN 36"
MIN 36"
W20-4
MIN 36"
MIN 36"
ROAD
AHEAD
ONE LANE
40 MPH OR LESS
OPTIONAL IF
W20-7B
MIN 36"
MIN 36"
W20-7A
MIN 36"
MIN 36"
(HIGHWAYS, 40 MPH OR LESS)
ALTERNATING 1-LANE, 2-WAY TRAFFIC: FLAGGER-CONTROLLED
30 35 4020SPEED (MPH)
B (feet)
25
115 155 200 250 305
OPTIONAL LONGITUDINAL BUFFER SPACE = B
Buffer space may be adjusted
20' 300' @
(OPTIONAL)40'
(OPTIONAL)
20' 260' @
8. ACTUAL CENTERLINE PAVEMENT MARKINGS MAY VARY.
7. SIGNS ARE BLACK ON ORANGE UNLESS OTHERWISE INDICATED.
6. FOR PROJECT-SPECIFIC REQUIREMENTS, SEE SPECIAL PROVISIONS.
24-INCH STOP/SLOW PADDLE SIZE9-35.1
TRAFFIC CONTROL PROCEDURES1-10.3(2)A
FLAGGERS AND NIGHTTIME ILLUMINATION1-10.3(1)A
HIGH-VISIBILITY APPAREL1-07.8(1)
5. SEE STANDARD SPECIFICATIONS FOR ADDITIONAL REQUIREMENTS:
(C) PROVIDE FREE SHUTTLE (WORK TRUCK, VAN, OR BUS MAY BE USED)
(B) COMBINE BIKES & VEHICULAR TRAFFIC. BIKES TO CLEAR PRIOR TO RELEASING ONCOMING TRAFFIC
(A) ALLOW PEDESTRIANS TO USE THE PAVED SHOULDER OR ADJACENT PATH OPPOSITE THE WORK AREA
4. PEDESTRIAN & BICYCLIST ACCOMMODATIONS (ENGINEER TO ACCEPT ANY ALTERNATIVE STRATEGIES):
3. MAY SHIFT LATERALLY. 36" TRAFFIC CONES, 42" TALL CHANNELIZATION DEVICES, OR TRAFFIC SAFETY DRUMS OK.
ADDITIONAL PVs MAY BE ADDED AT SEPARATE WORK CREWS.BUFFER SPACE IS REDUCED OR ELIMINATED.
PROTECTIVE VEHICLE MAY ALWAYS BE USED ON ROADWAYS 40 MPH OR LESS, EVEN IF THE LONGITUDINAL 2.
BY ADJUSTING LONGITUDINAL BUFFER SPACE.
1. AVOID PLACING LANE CLOSURE TAPERS WITHIN OR IMMEDIATELY FOLLOWING HORIZONTAL & VERTICAL CURVES
:NOTES
T
Y
P
.
M
IN
4
'
T
Y
P
.
M
IN
4
'
URBAN STREETS
RESIDENTAL & BUSINESS DISTRICTS
RURAL ROADS & URBAN ARTERIALS
RURAL ROADS & URBAN ARTERIALS 35-40 MPH
25-30 MPH
25 MPH OR LESS
ROADWAY CONDITIONS.
(2) THIS SPACING MAY BE REDUCED IN URBAN AREAS TO FIT
INTERCHANGE RAMPS, AT-GRADE INTERSECTIONS AND DRIVEWAYS.
(1) ALL SPACING MAY BE ADJUSTED TO ACCOMMODATE
RECOMMENDED SIGN SPACING = X (1)
10-20
10-20 40
TANGENTMPHTAPER
DEVICE SPACING (feet)
MAXIMUM CHANNELIZATION
60- 40 35
30 - 20
AREA
WORK
BE
PREPARED
TO STOP
ROAD
WORK
AHEAD
ROAD
WORK
AHEAD
BE
PREPARED
TO STOP
A
A
LANE
TRAFFIC
10' MIN