tc402-Traffic Control.pdf
PDF 132 KB Posted
- Attached to
- Davenport Tile Boring Replacement
- Solicitation number
- 645-RFB-1746-2025
- Issued by
- Scott County, Iowa
About this file
This is a standard road plan document (TC-402 Traffic Control) issued by the Iowa Department of Transportation (Iowa DOT) that provides specifications and guidelines for traffic control measures during road work activities. The document outlines requirements for traffic control devices, including END ROAD WORK signs (48" x 24"), ROAD WORK AHEAD signs (48" x 48"), and SHOULDER DROP OFF signs (48" x 48"), along with specific spacing and placement protocols for work areas ranging from 0 to 500 feet in length. The plan establishes channelizer spacing requirements based on speed limits, with spacing intervals of 40, 80, 100, or more feet depending on the posted speed limit (ranging from 40 mph to 70+ mph). For work areas less than 200 feet long, channelizer spacing may be reduced to 40 feet, and for work lasting less than one hour, reference document TC-1 applies. The specification requires use of revolving lights or amber strobe lights spaced at 20-foot centers for traffic control, and mandates specific mitigation measures for pavement edge drop-offs exceeding the pavement depth, with maximum allowable drop-offs governed by Article 1107.08.K2 of the Standard Specifications.
This traffic control standard plan document is applicable to the Davenport Tile Boring Replacement project (RFB #645-RFB-1746-2025), an Iowa DOT infrastructure improvement initiative involving subdrain pipe replacement, steel encasement, and topsoil management. The associated contract opportunity specifies a project completion date of November 15, 2025, with bid opening scheduled for May 7, 2025, at 5:25 PM CDT and closing on May 29, 2025, at 1:00 PM CDT. Site visits are permitted Monday through Thursday between 10:00 AM and 2:00 PM, with specific safety requirements for interstate shoulder access. Bidders must be registered with the Iowa Department of Workforce Development and demonstrate capability to execute the comprehensive infrastructure project. Performance and payment bonds may be required if the contracted amount exceeds $25,000. The Iowa DOT is a tax-exempt agency, and Davis-Bacon wages do not apply to this project. Monthly payments will cover up to 95 percent of the value of work performed, with deliveries designated as F.O.B. Destination.
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Text version
Traffic Control
Possible Contract Item:
END
ROAD WORK
48" x 24"
G20-2AROAD
WORK
AHEAD
48" x 48"
W20-1
SHOULDER
DROP
OFF
48" x 48"
W8-9A
Length of Work Area
0' - 500'
Spacing = C
5 devices
T
B
Shoulder Line
40 or less
45 - 50
55 - 60
65 - 70 1500'
1500'
700'
500' 250'
350'
500'
500' 230'
200'
200'
100'40'
80'
100'
100'
C TBA
LEGEND
Traffic Sign
Work Area
Direction of Traffic
42" Channelizer
A revolving light or amber strobe light.
spaced at 20 foot centers or use a vehicle with an amber
For work areas less than 200 feet long, use channelizers spacing to 40 feet.
Standard Specifications does not apply. Reduce channelizer less, the temporary fillet requirement of Article 1107.08 of the
When the length of a pavement edge drop-off is 1000 feet or
For work lasting less than one hour, refer to TC-1.
1107.08.K2 of the Standard Specifications.
Shoulder edge drop-offs shall be mitigated according to Article allowed during non-working hours.
No pavement edge drop-offs greater than pavement depth will be
DROP-OFF sign.
When a pavement edge drop-off exists, install a SHOULDER
TC-402
REVISION
4-18-23
SHEET 1 of 1
REVISIONS: Added speed limit note.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
OF TRAVELED WAY
WORK WITHIN 15 FT
* Speed Limit refers to regulatory speed limit before road work.
(mph)*
SPEED LIMIT
DOT
tc402
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