Washington Pilot Car Requirements
When does an oversize or overweight load need a pilot car or escort in Washington? Here are the width, height, length and weight thresholds that trigger an escort, a height pole, or a police escort.
Escort & pilot car requirements
- Lead (front) pilot carover 20'0" width
Front+rear pilots required on 4+-lane divided highways for widths over 20'. Lead+chase both required on all routes at this width (WAC 468-38-075).
- Height-pole escortover 14'6" height
Front pilot with height-clearance pole required for loads over 14'6" on all highway types. On 4+-lane roads, chase also required when load is over 12' wide (WAC 468-38-075).
- Chase (rear) pilot carover 125'0" length
Rear pilot required on 4+-lane divided highways for overall lengths over 125'. Superload classification applies at this threshold (WAC 468-38-075).
- Lead (front) pilot carover 105'0" length
Rear escort required for lengths over 105' on 2-lane roads. On 4+-lane, rear escort required over 125' (WAC 468-38-075).
- Chase (rear) pilot carover 14'0" width
Rear pilot required on 4+-lane divided highways for widths 14'1"–20'. Single chase position until 20' threshold; lead+chase both required above 20' (WAC 468-38-075).
- Lead (front) pilot carover 11'0" width
Front+rear pilots required on 2-lane undivided highways when width exceeds 11'. Conservative threshold; always confirm route in permit (WAC 468-38-075).
- Lead (front) pilot carover 20'0" front overhang front overhang
Front pilot required when front overhang exceeds 20' on 2-lane highways (WAC 468-38-075).
- Chase (rear) pilot carover 20'0" rear overhang rear overhang
Rear pilot required when rear overhang exceeds 20' on 2-lane highways or when rear overhang exceeds 1/3 of trailer/load length (WAC 468-38-075).
Travel restrictions
- Daylight-only travelover 12'0" width
Loads outside the 12'W / 14'6"H / 105'L nighttime envelope require permit notation 'Nighttime movement approved'. Commuter curfew applies in Seattle-Everett, Tacoma, Olympia, Vancouver corridors (WAC 468-38-075).
- Weekend / holiday restrictionover 11'0" width
No movement on New Year's, Memorial Day, Independence Day, Labor Day, Thanksgiving + day after, Christmas. Restrictions begin noon of preceding day for all oversize loads (WAC 468-38-095).
Driver & inspection requirements
- Certified escort driver requiredover 11'0" width
Washington requires Evergreen Safety Council certification for all escort drivers; 3-year renewal. Reciprocal with AZ, CO, GA, MN, NC, OK, UT, VA (WAC 468-38-100).
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Informational only. These thresholds are compiled from published Washington DOT references and are not legal or operational advice. Permit conditions can differ from the general tables, and rules change — always verify with the Washington permit office before you move a load.
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