02 / MEASUREMENTS
Match the truck to the road class.
Record trailer length as well as overall length.
OPER 753 separates Class I, Class II and non-designated highways. Its ordinary width and height entries are 8′6″ and 13′6″; length and access depend on the combination and highway class. A trailer-length figure alone cannot answer whether the full loaded rig fits a local approach.
Multiple pieces can change permit eligibility.
The dimensional guidance calls for reasonable disassembly and says multiple objects placed beside, behind or on top of one another may not create the overdimension. Provide the piece count and loading arrangement when requesting help, especially if the quote includes attachments carried on the same trailer.
03 / FEES
Illinois miles belong in the estimate.
Choose the envelope before the mileage band.
Section 15-305 groups legal-weight overdimension moves by width, height and overall length, then prices the single trip by distance. Crossing into the next dimension or mileage band changes the fee. House trailer combinations and overweight movements use other schedules; the example below is one defined dimensional move.
Keep police and local costs separate.
The same statute specifies that required Illinois State Police escort charges are additional to the permit fee. Local and toll-road permissions are also separate from the IDOT permit. The calculator's agency subtotal does not include a pilot-car quote or an ODPermit service markup.
Calculator fee reference: IDOT Table2 — practical maximum overweight fee categories
04 / ESCORTS
Read the combined-dimension conditions.
Two triggers can mean two escorts.
OPER 993 requires one civilian escort above 14′6″ width, 14′6″ height or 110′ length; two or more of those triggers require front and rear escorts. It specifies three civilian escorts above 16′ width, 18′ height or 145′ length. Police requirements begin at larger dimensions or when bridge/district review requires them.
The issued conditions take priority.
The permit's specific provisions control over general OPER 993 wording. Carry both the permit and the applicable provisions; printed and electronic copies are accepted. Check the travel window, required height pole, bridge conditions and any agency coordination on that particular permit before dispatch.
BEFORE DISPATCH
Match the paperwork to the move.
- Record the loaded rig, trailer length, piece count and road class for the approach.
- Use the miles traveled inside Illinois when estimating the state fee.
- Arrange local/toll permissions and have OPER 993 with the driver alongside the issued permit.
The issued permit controls the authorized vehicle, load, route and travel conditions. Check current closures and the pickup and delivery approaches. A planning estimate does not approve clearance or replace the permit.
SOURCE RECORD
Go straight to the authority.
ODPermit prepared this guide with AI-assisted review of the official sources below on . This is a dated planning reference, not agency approval or an independently certified legal review. Source dates and the roads, product and load covered by each rule matter.
- IDOT permit type and compliance
Driver copy, OPER 993 and separate local/toll permissions
Official page checked September 7, 2026 - IDOT OPER 753 legal dimensions and weights
Pages 1–2: Class I, Class II, non-designated routes and load arrangement
Revision January 5, 2023; official published copy checked September 7, 2026 - Illinois Vehicle Code 15-305
Legal-weight overdimension envelopes, mileage bands and separate police costs
Current statute including May 13, 2022 amendment; checked September 7, 2026 - IDOT OPER 993 movement provisions
Pages 1 and 5–6: precedence, civilian/police escorts and special conditions
Revision August 7, 2024; official published copy checked September 7, 2026