tc218 (2).pdf
PDF 200 KB Posted
- Solicitation number
- 645-RFB-2407-2026
- Issued by
- Johnson County, Iowa
About this file
This is a Standard Road Plan document issued by the Iowa Department of Transportation (Iowa DOT) that provides detailed traffic control specifications for temporary traffic signal installation, flagger-operated signals, pilot car operations, and lane closures on roadways. The plan establishes standardized requirements for traffic control zones and specifies sign placements, signal head locations, and timing protocols based on average daily traffic (ADT) volumes. Key specifications include 48" x 48" warning signs for "Road Work Ahead" and "One Lane Road Ahead," push-button actuated traffic signals with defined timing parameters (initial green of 15 seconds, yellow of 4.0 seconds, and green extension of 2.5 seconds), and channelizer spacing at 160 feet center-to-center with 100-foot minimum spacing. The plan addresses temporary traffic signal requirements, flagger operations, pilot car deployment, and portable rumble strip panels, with specific installation guidance for signal heads positioned 70 to 100 feet beyond "Stop Here on Red" surface markers and mounted a minimum of 8 feet from ground level. Documentation references Section TC-218 and related standard specifications, with revision date of April 18, 2023.
The document establishes performance standards applicable across different speed limit ranges and ADT classifications, from roads with fewer than 2,500 vehicles daily to those exceeding 5,000 vehicles daily. Traffic control zones lasting more than two hours require temporary signage, and signal head placement may be adjusted based on field conditions. For shoulder-mounted signal configurations, signal heads may be positioned on both sides of the roadway as an alternative to trailer or span-wire mounted systems. The plan does not specify pricing information, set-asides, or funding sources, as it serves as a design reference and standard specification document for implementing temporary traffic control measures on Iowa roadways.
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Text version
48" x 48"
W20-4
ONE LANE
ROAD
AHEAD
END
ROAD WORK
48" x 24"
G20-2A
STOP
HERE ON
RED
24" x 36"
R10-6
END
ROAD WORK
48" x 24"
G20-2A
STOP
HERE ON
RED
24" x 36"
R10-6
ADT
up to 2,500
2,500 - 5,000 more than 5,000
50 or greater
A
500'
500'
1000' 1.5 mi.
2.0 mi.
2.5 mi.
H
Turnaround
Pilot Car
A Turnaround
Pilot Car200'-300'
Traffic Sign
Work Area
Direction of Traffic
LEGEND
H
500'
48" x 48"
W3-3
48" x 48"
W3-3
48" x 48"
W3-3
GREEN and GREEN EXTENSION only are initiated by flagger.
Program signals to rest in RED.
Install push-button actuated traffic signals.
Yellow = 4.0 sec.
Green Ext. = 2.5 sec.
Initial Green = 15 sec.
Timing for Push-button Actuated Signals
No detection area required.
48" x 48"
W20-4
ONE LANE
ROAD
AHEAD
500' A
48" x 48"
W3-3
42" Channelizer
160' C/C 100' min.
108-28
108-27
Possible Tabulations:
Traffic Control
Temporary Traffic Signal
Pilot Car
Flagger
Possible Contract Items:
Temporary Traffic Signal
Flagger
5 Devices 100'
Portable Rumble Strip Panel
A
ROAD
WORK
AHEAD
48" x 48"
W20-1
A
ROAD
WORK
AHEAD
48" x 48"
W20-1
A/2 A/2
A/2 A/2
48" x 48"
W20-9
RUMBLE
STRIPS
AHEAD
48" x 48"
W20-9
RUMBLE
STRIPS
AHEAD
2528.03
Portable Rumble Strip Panel.
For traffic control zones lasting more than 2 hours, place temporary sign. Adjust location of signal heads as field conditions warrant.
Locate signal heads 70 to 100 feet beyond "STOP HERE ON RED" surface.
from the bottom of the signal head to the top of the ground roadway. Mount shoulder signal heads a minimum of 8 feet may be located on the shoulders, one on each side of the
In lieu of a trailor or span-wire mounted system, signal heads of the Standard Specifications except for the following:
For Temporary Traffic Signals, meet the requirements of Section
TC-218
REVISION
4-18-23
SHEET 1 of 1
REVISIONS: Added speed limit note. Formatted speed limit table.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
FLAGGER OPERATED SIGNALS
PILOT CAR AND
LANE CLOSURE WITH
DESIGNER INFORMATION
(mph)*
SPEED LIMIT
* Speed Limit refers to regulatory speed limit before road work.
2528.03
108-27
108-28
../../GS/content/2528.htm https://iowadot.gov/design/tnt/PDFsandWebFiles/IndividualPDFs/0108-27.PDF https://iowadot.gov/design/tnt/PDFsandWebFiles/IndividualPDFs/0108-28.PDF https://www.iowadot.gov/design/dmanual/01e-06.pdf http://www.iowadot.gov/design/dmanual/01e-06/TC-218.pdf tc218
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