k24.20-00_e.pdfLONGITUDINAL
BUFFER SPACE
= B
POSTED SPEED (MPH)
25
30
35
40
45
50
55
60
LENGTH B (FEET)
155
200
250
305
360
425
495
570
BUFFER DATA
TYPICAL PROTECTIVE VEHICLE WITH TMA (SEE NOTE 1)
VEHICLE TYPE
LOADED WEIGHT
4 YARD DUMP TRUCK,
MINIMUM WEIGHT 15,000 LBS.
SERVICE TRUCK,
(MAXIMUM WEIGHT SHALL BE
IN ACCORDANCE WITH MANU-
FLAT BED, ETC.
FACTURER RECOMMENDATION)
0 1 ROLL AHEAD STOPPING DISTANCE = 30 FEET MIN.
(DRY PAVEMENT ASSUMED)
END G20-2A OR
ROAD WORK DOWNSTREAM TAPER TO SHOW
END OF WORK AREA - SEE NOTE 6
100' 1 1
A
WORK AREA
MINIMUM
TAPER
LENGTH = L (FEET)
LANE WIDTH
(FEET)
25 30
POSTED SPEED (MPH)
35 40 45 50 55 60 65 70
10
105
150
205
270
450
500
550
-
-
-
11
115
165
225
294
495
550
605
660
-
-
12
125
180
245
320
540
600
660
720
780
840
CHANNELIZING DEVICE SPACING
POSTED SPEED
(MPH)
IN TAPER
(FEET)
IN TANGENT
(FEET)
50 / 70
40
80
35/45
30
60
25/30
20
40
SIGN SPACING = X (1)
RURAL HIGHWAYS
60 / 65 MPH
800' f
RURAL ROADS
45 / 55 MPH
500' f
RURAL ROADS & URBAN ARTERIALS
35 / 40 MPH
350' f
RURAL ROADS, URBAN ARTERIALS,
RESIDENTIAL & BUSINESS DISTRICTS
25 / 30 MPH
200' t (2)
URBAN STREETS
25 MPH OR LESS
100' t (2)
ALL SIGNS ARE BLACK ON ORANGE UNLESS DESIGNATED OTHERWISE
(1) ALL SIGN SPACING MAY BE ADJUSTED TO ACCOMMODATE
AT -GRADE INTERSECTIONS, AND DRIVEWAYS.
(2) THIS SIGN SPACING MAY BE REDUCED IN URBAN AREAS TO FIT
ROADWAY CONDITIONS.
CLOSED
AHEAD
o � B L �
_I SEE NOTE 2
0 0 0 0 0 0 0
TEMPORARY LANE - 12' MIN.
EXISTING
SHOULDER
J
EXISTING LANE
- COMPLIANCE DATE 12
SEE NOTE 5 �7 p
'j
LATERAL BUFFER - 4'
WORK AREA
EXISTING LANE
2'
SECTION OA
0
O
0
W5-1
ROAD
NARROWS
EXISTING
SHOULDER
W20-5R
IE
n
1
X
0
K
iI 'r-1.1 -7A
a
NOTES
1. A Protective Vehicle is recommended regardless if a Truck
Mounted Attenuator (TMA) is available; a work vehicle may
be used. When no TMA is used, the Protective Vehicle
shall be strategically located to shield workers, with no
specific Roll -Ahead Stopping Distance.
2. Extend device taper (LJ3) across shoulder — recommended.
3. Portable Changeable Message Sign (PCMS)
recommended.
4. Traffic Safety Drums for all tapers on high speed roadway
recommended.
5. Transverse Devices in closed lane every 1000' t
recommended.
6. Channelizing Device spacing for the downstream taper
option shall be 20' O.C.
7. Use advanced notice for any overwidth loads prior to lane
closure for altenative routes if applicable — recommended.
8. For signs size refer to Manual on Uniform Traffic Control
Devices (MUTCD) and WSDOT Sign Fabrication Manual
M 55-05.
FOR LOCAL AGENCY USE ONLY
NOT FOR USE ON STATE ROUTES
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EXPIRES AUGUST 9, 2007 2 m S
SINGLE LANE CLOSURE
WITH ENCROACHMENT
STANDARD PLAN K-24.20-00
SHEET 1 OF 1 SHEET
APPROVED FOR PUBLICATION
Ken L. Smith 02-15-07
Adft STATE DESIGN ENGINEER DATE
MAP Washington State Department of Transportation