tc214 (2).pdf
PDF 205 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) for traffic control zones involving pilot cars with flaggers and lane closures. The document, designated TC-214 (Revision 4-18-23), provides standardized traffic control specifications for road work operations across varying traffic conditions and roadway speeds. The plan establishes requirements for advance warning signage, device spacing, work area dimensions, and flagger positioning based on Average Annual Daily Traffic (AADT) volumes and posted speed limits. Key specifications include minimum spacing requirements ranging from 250 to 500 feet depending on traffic volume, advance signing distances (C) varying from 40 to 160 feet, and maximum work area dimensions (H) extending from 500 to 2,000 feet. For traffic control zones exceeding two hours in duration, portable rumble strip panels are mandated. The document references related sign standards (W20-1, W20-4, W20-7A, W20-9, and G20-2A) and directs users to standard specification SI-881 for additional sign details.
The traffic control plan applies to rural and urban areas where lane closures are implemented with pilot car and flagger support. Work area extensions up to one mile beyond the maximum dimension H are permitted in rural settings as work progresses, with the requirement that advanced signing and devices be repositioned to maintain compliant spacing. Speed limit regulatory requirements are incorporated into the advance signing specifications, with a formatted speed limit table providing guidance for appropriate signing distances. This standard plan serves as a baseline control document for construction projects within Iowa DOT's jurisdiction, ensuring consistent and safe traffic management protocols across all districts and work sites.
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Text version
ROAD
WORK
AHEAD
48" x 48"
W20-1
48" x 48"
W20-4
ONE LANE
ROAD
AHEAD
48" x 48"
W20-7A
48" x 48"
W20-7A
END
ROAD WORK
48" x 24"
G20-2A
END
ROAD WORK
48" x 24"
G20-2A
ROAD
WORK
AHEAD
48" x 48"
W20-1
48" x 48"
W20-4
ONE LANE
ROAD
AHEAD
48" x 48"
W20-7A
48" x 48"
W20-7A
Turnaround
Pilot Car
250' min.
5 Devices
T E
H
Turnaround
Pilot Car
Spacing = C
35 or less
40 - 45
50 or greater more than 5,000
2,500 - 5,000 up to 2,500 more than 5,000
2,500 - 5,000 up to 2,500 more than 5,000
2,500 - 5,000 up to 2,500 250'
250'
500'
350'
AADT C
40' 0'-200'
0'-200'40'
40' 0'-200'
0'-200'80'
80'350' 0'-200'
700' 80' 0'-200'
500' 160' 200'-300'
500' 160' 200'-300'
1000' 160' 200'-300'
E F H max.
T
500'
500'
1000'
700'
700'
1400'
1000'
1000'
2000' 1.5 mi.
2.0 mi.
2.5 mi.
1.5 mi.
2.0 mi.
2.5 mi.
1.5 mi.
2.0 mi.
2.5 mi. 50'
50'
50'
100'
100'
100'
100'
100'
100'
Traffic Sign
Flagger
Work Area
Direction of Traffic
LEGEND
Sign optional for ADT less than 5,000.
42'' Channelizer contract documents.
not be allowed during any peak traffic hours listed in the the limits shown in the table. This one-mile extension will downstream so that the H distance is once again within beginning of the traffic control zone should be moved progressed, the advanced signing and devices at the placed to extend the closure and after work activity has in the table. After the traffic control devices have been up to 1.0 mile beyond the maximum distance, H, shown limits of dimension H, the lane closure may be extended
In rural areas, as work activity nears the downstream
Portable Rumble Strip Panel
A A
AA
Traffic Control
Pilot Car
Flagger
Possible Contract Items:
F
A/2 A/2
F
A/2A/2
3 Refer to for sign details.
48" x 48"
W20-9
RUMBLE
STRIPS
AHEAD
48" x 48"
W20-9
RUMBLE
STRIPS
AHEAD
temporary Portable Rumble Strip Panel.
For traffic control zones lasting more than 2 hours, place
TC-214
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
FOR USE WITH PILOT CAR
WITH FLAGGERS
LANE CLOSURE
FA A
END
ROAD WORK
48" x 24"
G20-2A
ROAD
WORK
AHEAD
48" x 48"
W20-1
48" x 48"
W20-4
ONE LANE
ROAD
AHEAD
48" x 48"
W20-7A
Advance signing when portable rumble strips are not used
(mph)*
SPEED LIMIT
* Speed Limit refers to regulatory speed limit before road work.
SI-881
https://iowadot.gov/design/SRP/IndividualStandards/si881.pdf tc214
File details come from the government source that posted it. Updated .