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2003 Edition
CHAPTER 6H. TYPICAL APPLICATIONS
Section 6H.Ol Typical Applications
Support: ~,.e,~
Whenever the acronym "TTC" is used in this Chapter, it refers to "temporary traffic control".
Standard:
The needs and control of all road users (motorists, bicyclists, and pedestrians within the highway,
including persons with disabilities in accordance with the Americans with Disabilities Act of 1990 (ADA),
Title II, Paragraph 35.130) through a TIC zone shall he an essential part of highway construction, utility
work, maintenance operations, and the management of traffic incidents.
Support:
Chapter 6G contains discussions of typical TTC activities. Chapter 6H presents typical applications for a
variety of situations commonly encountered. While not every situation is addressed, the information illustrated
can generally be adapted to a broad range of conditions. In many instances, an appropriate TTC plan is achieved
by combining features from various typical applications. For example, work at an intersection might present a
near-side work zone for one street and a far-side work zone for the other street. These treatments are found in
two different typical applications, while a third typical application shows how to handle pedestrian crosswalk
closures. For convenience in using the typical application diagrams, Tables 6C-1 and 6C-4 are reproduced in this
Chapter as Tables 6H-3 and 6H-4, respectively.
Procedures for establishing TTC zones vary with such conditions as road configuration, location of the work,
work activity, duration of work, road user volumes, road vehicle mix (buses, trucks, cars, motorcycles, and
bicycles), and road user speeds. Examples are presented in this Chapter showing how to apply principles and
standards. Applying these guidelines to actual situations and adjusting to field conditions requires judgment.
In general, the procedures illustrated represent minimum solutions for the situations depicted.
Option:
Other devices may be added to supplement the devices and device spacing may be adjusted to provide
, additional reaction time or delineation. Fewer devices may be used based on field conditions.
Support:
Figures and tables found throughout Part 6 provide information for the development of TTC plans. Also,
Table 6H-3 is used for the determination of sign spacing and other dimensions for various area and roadway
types.
Table 6H-1 is an index of the 46 typical applications. Typical applications are shown on the right page with
notes on the facing page to the left. The legend for the symbols used in the typical applications is provided in
Table 6H-2. In many of the typical applications, sign spacings and other dimensions are indicated by letters using
the criteria provided in Table 6H-3. The formulas for determining taper lengths are provided in Table 6H-4.
Most of the typical applications show TTC devices for only one direction.
Sect. fiH.01
Page 6H-2 2003 Edition
Table 6H-1. Index to Typical Applications (Sheet 1 of 2)
Typical Application Description Typical Application Number
Work Outside. of Shoulder (see Section 6G.06)
Work Beyond the Shoulder TA-1
Blasting Zone TA-2
Work on the Shoulder (see Sections 6G.oi and 6G.08)
Work on Shoulders TA-3
Short Duration or Mobile Operation on Shoulder TA-4
Shoulder Closure on Freeway TA-5
Shoulder Work with Minor Encroachment TA-6
Work Within the Traveled Way of Two-Lane Highways (see Section 6G.10)
Road Closed with Diversion TA-7
Roads Closed with Off-Site Detour TA-8
Overlapping Routes with Detour TA-9
Lane Closure on Two-Lane Road Using Flaggers TA-10
Lane Closure on Two-Lane Road with Low Traffic Volumes TA-11
Lane Closure on Two-Lane Road Using Traffic Control Signals TA-12
Temporary Road Closure TA-13
Haul Road Crossing TA-14
Work in Center of Road with Low Traffic Volumes TA-15
Surveying Along Centerline of Road with Low Traffic Volumes TA-16
Mobile Operations on Two-Lane Road TA-17
Work Within the Traveled Way of Urban Streets (see Section 6G.11)
Lane Closure on Minor Street TA-18
Detour for One Travel Direction TA-19
Detour for Closed Street TA-20
.
Wc;>rk Within the Travele~ Way at an Intersection and Sidewalks (see Section 6G.13)
Lane Closure on Near Side of Intersection TA-21
Right Lane Closure on Far Side of Intersection TA-22
Left Lane Closure on Far Side of Intersection TA-23
Half Road Closure on Far Side of Intersection TA-24
Multiple Lane Closures at Intersection TA-25
Closure in Center of Intersection TA-26
Closure at Side of Intersection TA-27
Sidewalk Closures and Bypass Sidewalks TA-28
Crosswalk Closures and Pedestrian Detours TA-29
Sect. 6H.OI
2003 Edition Page 6H-3
Table 6H·1. Index to Typical Applications (Sheet 2 of 2)
Typical Application Description Typical Application Number
Work Within the Traveled Way of Multi-lane, Nonaccess Controlled Highways (see .Section 6G.12)
Interior Lane Closure on Multi-lane Street TA-30
Lane Closure on Street with Uneven Directional Volumes TA-31
Half Road Closure on Multi-lane, High-Speed Highway TA-32
Lane Closure on Divided Highway TA-33
Lane Closure with Temporary Traffic Barrier TA-34
Mobile Operation on Multi-lane Road TA-35
Woik Within t~eTraveled Way of Expressways and Freeways (see Section 6G.14)
Lane Shift on Freeway TA-36
Double Lane Closure on Freeway TA-37
Interior Lane Closure on Freeway TA-38
Median Crossover on Freeway TA-39
Median Crossover for Entrance Ramp TA-40
Median Crossover for Exit Ramp TA-41
Work in Vicinity of Exit Ramp TA-42
Partial Exit Ramp Closure TA-43
Work in Vicinity of Entrance Ramp TA-44
Temporary Reversible Lane Using Movable Barriers TA-45
Work in the Vicinity of Highway-Rail Grade Crossings (see Section 6G'19)
Work in Vicinity of Highway-Rail Grade Crossing TA-46
Sect. 6H.01
Page 6H-4
Sect. 6H.Ol
Table 6H-2. Meaning of Symbols on Typical Application Diagrams
Ill
0 0 0
H
Iii
~
~
~
i;r-<'
l
C: 0
'''''
E9
Arrow panel
Arrow panel support or trailer
(shown facing down)
Changeable message sign or support trailer
Channelizing device
Crash Cushion
Direction of temporary traffic detour
Direction of traffic
Flagger
High level warning device
(Flag tree)
Luminalre
Pavement markings that should be
removed for a long term project
Sign (shown facing left)
Surveyor
Temporary barrier
E0:-3 Temporary barrier with warning lights r Traffic or Pedestrian signal
lz:sl Truck mounted attenuator
l'\\'\'\I Type Ill Barricade
8 Warning lights
~ Workspace
8EJlil Work vehicle
2003 Edition
2003 Edition
Table 6H-3. Meaning of Letter Codes on
Typical Application Diagrams
Distance Between Signs**
Road Type
A B C
Urban (low speed)' 30 (100) 30 (100) 30 (100)
Urban (high speed)' 100 (350) 100 (350) 100 (350)
Rural 150 (500) 150 (500) 150 (500)
Expressway / Freeway 300 (1,000) 450 (1,500) 800 (2,640)
• Speed category to be determined by highway agency
.. Distances are shown in meters (feet). The column headings A, B, and C are the dimensions
shown in Figures 6H-1 through 6H-46. The A dimension is the distance from the transition or
point of restriction to the first sign. The B dimension is the distance between the first and second
signs. The C dimension is the distance between the second and third signs. (The third sign is the
first one in a three-sign series encountered by a driver approaching a TIC zone.)
Table 6H-4. Formulas for Determining Taper Lengths
Speed Limit (S)
Taper Length (L)
Meters
Speed Limit (S)
Taper Length (L)
Feet
60 km/h or less WS2
L= 155 40 mph or less WS2 L=-60
70 km/h or more L= WS
1.6
45 mph or more L=WS
Where: L = taper length in meters (feet)
w = width of offset in meters (feet)
S = posted speed limit, or off-peak 85th-percentile speed prior to work starting, or the
anticipated operating speed in km/h (mph)
Page 6H-5
S~cl. 6H.01
Page 6H-6
Notes for Figure 6H-1-Typica1Application 1
Work Beyond the Shoulder
Guidance:
2003 Edition
I. If the work space is in the median of a divided highway, an advance warning sign should also be placed
on the left side of the directional roadway.
Option:
2. The ROAD WORK AHEAD sign may be replaced with other appropriate signs such as the SHOULDER
WORK sign. The SHOULDER WORK sign may be used for work adjacent to the shoulder.
3. The ROAD WORK AHEAD sign may be omitted where the work space is behind a barrier, more than
600 mm (24 in) behind the curb, or 4.6 m (15 ft) or more from the edge of any roadway.
4. For short-term, short-duration or mobile operation, all signs and channelizing devices may be eliminated
if a vehicle with activated high-intensity rotating, flashing, oscillating, or strobe lights is used.
5. Vehicle hazard warning signals may be used to supplement high-intensity rotating, flashing, oscillating,
or strobe lights.
Standard:
6-Vehicle hazard warning signals shall not be used instead of the vehicle's high-intensity rotating,
flashing, oscillating, or strobe lights.
Page 6H-24
Notes for Figure 6H-10-Typical Application 10
Lane Closure on Two-Lane Road Using Flaggers
Option:
2003 Edition
l. For low-volume situations with short work zones on straight roadways where the flagger is visible to
road users approaching from both directions, a single flagger, positioned to be visible to road users
approaching from both directions, may be used (see Chapter 6E).
2. The ROAD WORK AHEAD and the END ROAD WORK signs may be omitted for short-duration
operations.
3. Flashing warning lights and/or flags may be used to call attention to the advance warning signs.
A BE PREPARED TO STOP sign may be added to the sign series.
Guidance:
4. The buffer space should be extended so that the two-way traffic taper is placed before a horizontal (or
crest vertical) curve to provide adequate sight distance for the flagger and a queue of stopped vehicles.
Standard:
5. At night, flogger stations shall be Illuminated, except in emergencies.
Guidance:
6. When used, the BE PREPARED TO STOP sign should be located between the Flagger sign and the
ONE LANE ROAD sign.
7. When a highway-rail grade crossing exists within or upstream of the transition area and it is anticipated
that queues resulting from the lane closure might extend through the highway-rail grade crossing, the
ITC zone should be extended so that the transition area precedes the highway-rail grade crossing.
8. When a highway-rail grade crossing equipped with active warning devices exists within the activity area,
provisions should be made for keeping flaggers informed as to the activation status of these warning
devices.
9. When a highway-rail grade crossing exists within the activity area, drivers operating on the left side of
the normal centerline should be provided with comparable warning devices as for drivers operating on
the right side of the normal centerline.
10. Early coordination with the railroad company should occur before work starts.
Option:
11. A flagger or a uniformed law enforcement officer may be used at the highway-rail grade crossing to
minimize the probability that vehicles are stopped within 4.6 m (15 ft) of the highway-rail grade
crossing, measured from both sides of the outside rails.
..
2003 Edition
Figure 6H-10. Lane Closure on Two-Lane Road Using Flaggers (TA-10)
Note: See Tables 6H-2 and 6H-3
for the meaning of the
symbols and/or letter
codes used in this figure.
Note: The butter space should be
extended so that the ~o-way
traffic taper is placed before
a horizontal (or crest vertical)
curve to provide adequate
sight distance for the
flagger and a queue of
stopped vehicles.
m
(100 ft)
MAX
One Lane Two-Way Traffic Taper
30 m (100 ft) MAX
Typical Application 1 O
Page 6H-25
Core Design, Inc.
14.711 N.E. 29th Place Suife #101
Bellevue, Washington 98007
425. 885.7877 Fax 425. 885.7963
S3:JJ/\lJ3S 3Sn ON\11
AlNno::i 9NJ>I
tOOZ t 1 .1.:10
TECHNJICAJL INFORMATION REPORT
(T.][.R.)
FOR
EVENDEJLJL
KING COUNTY, WASHINGTON
R~vte,vd.M ~ a~-~ru 2-/zJ!/or
Prepared by: Gina R. Brooks, P.E.
April 2004 Date:
Revised: July 2004
Core No.: 04009
ENGINEERING PLANNING SURVEYING
EVENDELL
TABLE OF CONTENTS
I. Project Overview
2. Conditions and Requirements Summary
3. Off-Site Analysis
4. Flow Control and Water Quality Facility Analysis and Design
5. Conveyance System Analysis and Design
6. Special Reports and Studies
7. Other Permits
8. ESC Analysis and Design
9. Bond Quantities, Facility Summaries, and Declaration of Covenant
IO.Operations and Maintenance Manual