TC-418 Lane Closure on Divided Highway.pdf
PDF 247 KB Posted
- Solicitation number
- 645-RFB-2407-2026
- Issued by
- Johnson County, Iowa
About this file
This is a Request for Bids issued by the Iowa Department of Transportation for District 6 Rock to Road - Shoulder Aggregate Class A Stone procurement. The project involves the supply and placement of Class A stone aggregate across five maintenance garage areas at multiple highway locations: Urbana (3,025 tons on Highway 150), Tipton (3,500 tons on Highway 130), Coralville (1,400 tons on Highway 218 and 2,000 tons on Highway 1N), Independence (2,900 tons on Highway 187), and Dyersville (1,019 tons on Highway 20 WB and 382 tons on Highway 20 EB), totaling approximately 12,226 tons. Bidders must submit comprehensive per-ton pricing that includes rock, delivery, and shoulder placement services and are required to bid on all lines within a specific group. A pre-bid meeting is scheduled for January 20, 2026, at 2:30 p.m. CST, with the bid submission deadline of February 10, 2026, at 1:00 p.m. CST. The contract will run from execution through December 31, 2026, with no renewal options.
Bidders must provide a traffic control certificate for night work at Coralville locations, obtainable directly or through a subcontractor. Material delivery is restricted to normal working days between 7:30 a.m. and 3:30 p.m., requiring 24-hour notification prior to delivery and completion within ten working days of order placement. Payment terms are net 60 with all pricing submitted in US dollars. Evaluation criteria will consider cost, past work performance, work capacity, and ability to meet mandatory requirements and schedules. The Iowa DOT reserves the right to select delivery points and tonnage awarded to any single bidder, with the potential to purchase from alternative sources if the awarded vendor cannot provide product within 20 days. The solicitation does not explicitly mention specific set-aside designations or restrictions for disadvantaged enterprises.
View the file
Other files
| File | Type | Posted |
|---|---|---|
| tc212 (2).pdf | ||
| Allowable Lane Closure Map - DOT District 6.pdf | ||
| 1362522-event.pdf | ||
| tc431 (4).pdf | ||
| tc214 (2).pdf | ||
| Aggregate+Gradation+Table (1).pdf | ||
| Section 4120 _ Revised 10_21_2025.pdf | ||
| Scope of Work REVISED.pdf | ||
| tc218 (2).pdf | ||
| DistrictMapD6 (5)_Redacted.pdf |
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Text version
X
Traffic Control
Possible Contract Item:
65 - 70 100'910'
500'
250'
1000'
55 - 60
50'
700'65'100'
700'
0'-300'
0'-200'
700'50
45 0'-400'
45'80'
320'
100'630'400'
50'
80'
80'
40'
40'
35'
100'1000'
DCA
45'
245'
M
35 or less
T
100'
100'
600'
E
55' 770'
630'
(mph)*
LIMIT
SPEED
S id e R o a d
P o s s ib le
Traffic Sign
Direction Of Traffic
LEGEND
Drum
Work Area
48" x 48"
W20-5
CLOSED
AHEAD
LEFT LANE
48" x 48"
W4-2M
MERGE
48" x 48"
W20-5
RIGHT LANE
CLOSED
AHEAD
48" x 48"
W4-2M
MERGE
1 ROAD
WORK
AHEAD
48" x 48"
W20-1
48" x 48"
W4-2
48" x 48"
W4-2
END
ROAD WORK
48" x 24"
G20-2A
END
ROAD WORK
48" x 24"
G20-2A
LIMIT
SPEED
48" x 60"
R2-1
S id e R o a d
P o s s ib le
ROAD
WORK
AHEAD
48" x 48"
W20-1
42" Channelizer
A1
1000'
A
0' to 500'
A
M E 8 mile max.
E 8 mile max.MAA
0' to 500'
5 Devices
0' to 500' 5 devices
T
Spacing = D a BUMP (W8-1) sign is placed.
cross over the drop-off or rise, except for ramp locations where
Where there is a lane line drop-off or rise, do not allow traffic to than 150 feet.
Additional drums need not be placed for full depth excavations spaced closer excavations in a closed lane, place two drums in front of each location.
For lanes closed to traffic, place two drums every 1000 feet. For full depth
Sign at the end of the merge taper.
For traffic control zones lasting more than 4 hours, place a Speed Feedback
55 mph speed limit is in effect.
Remove or cover all existing signs that conflict with 55 mph speed limit while signs in the closed lane at 1-mile intervals.
When the length of closure is greater than 1 mile, install SPEED LIMIT 55
Place SPEED LIMIT 55 signs prior to the lane closure as shown.
For roadways with a posted speed limit of 60 mph or greater before road work:
similar location.
Place a ROAD WORK AHEAD sign on the opposite side of the intersection in a
Where side road speed limit is 40 mph or less, a distance of 200 feet is allowed.
Refer to SI-881 for sign details.
A1
250'
500'
700'
700'
2000'
2000'
A1
1000'
ROAD
WORK
AHEAD
48" x 48"
W20-1
ROAD
WORK
AHEAD
48" x 48"
W20-1
LIMIT
SPEED
48" x 60"
R2-1
0' to 500'
500'
Spacing = CSpacing = D
5 devices
T
X X
X X
X X
X X X X
X X
X
LIMIT
SPEED
48" x 60"
R2-1
500'
5 Devices
Spacing = C
Arrow Board
LIMIT
SPEED
48" x 60"
R2-1 allowed during non-working hours.
Lane line drop-offs greater than a nominal 4 inches are not
X
X
X
X
X
X
X
X
Speed Feedback Sign
TC-418
REVISION
4-18-23
SHEET 1 of 1
REVISIONS: Added speed limit note.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
LANE CLOSURE ON DIVIDED HIGHWAY
* Speed Limit refers to regulatory speed limit before road work.
DOT
tc418
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