Illinois Pilot Car Requirements

When does an oversize or overweight load need a pilot car or escort in Illinois? Here are the width, height, length and weight thresholds that trigger an escort, a height pole, or a police escort.

✓ Cross-checked against the state sourceIllinois permit source →

Escort & pilot car requirements

  • Police / law-enforcement escortover 200'0" length

    State police escort required for overall lengths over 200' (92 Ill. Adm. Code 554.204).

  • Police / law-enforcement escortover 18'0" width

    State police escort required for widths over 18' on all highways (92 Ill. Adm. Code 554.204).

  • Police / law-enforcement escortover 18'0" height

    State police escort required for heights over 18' (92 Ill. Adm. Code 554.204).

  • Lead (front) pilot carover 145'0" length

    Front pilot car required for combinations over 145' overall length on 2-lane highways.

  • Chase (rear) pilot carover 110'0" length

    Rear pilot car required for combinations over 110' overall length.

  • Lead (front) pilot carover 14'6" width

    Front pilot car required on 2-lane undivided highways when width exceeds 14'6" (554.208).

  • Chase (rear) pilot carover 14'6" width

    Rear pilot car required on divided highways when width exceeds 14'6" (554.208).

  • Height-pole escortover 14'6" height

    Height-pole vehicle required when load exceeds 14'6" in height (92 Ill. Adm. Code 554.208).

Travel restrictions

  • Daylight-only travelover 14'6" width

    Travel restricted to Mon–Fri sunrise–sunset and Sat sunrise–noon for widths over 14'6".

  • Weekend / holiday restrictionover 14'6" width

    No travel on New Year's Day, Memorial Day, July 4, Labor Day, Thanksgiving, or Christmas.

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Informational only. These thresholds are compiled from published Illinois DOT references and are not legal or operational advice. Permit conditions can differ from the general tables, and rules change — always verify with the Illinois permit office before you move a load.

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