Maine Oversize Load Permits, Regulations & Axle Rules

Maine calls its oversize and overweight permits overlimit permits, and every overlimit load (anything that exceeds legal dimensions or weight) is confined to daylight travel: one-half hour before sunrise to one-half hour after sunset. That window shrinks further once the calendar turns.

From April 22 through November 18, weekday travel runs the full daylight span, but Saturday is cut to a noon hard stop (one-half hour before sunrise to 12:00 PM). During the heart of summer, June 3 through August 26, Saturday travel on I-95 is squeezed again, to a 9:00 AM cutoff. On all other roads in that window, the noon limit still applies. Sunday travel is prohibited statewide in July and August. The only carve-out is for oversized equipment (logging, construction, or agricultural machinery) moving entirely within Maine's seven northern counties (Aroostook, Franklin, Oxford, Penobscot, Piscataquis, Somerset, and Washington), and even then the move must wrap up by 9:00 AM.

Seven holidays are full travel blackouts for all overlimit loads: New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, the Friday after Thanksgiving, and Christmas Day. A second tier of state holidays (including Martin Luther King Jr. Day, Presidents Day, Patriots Day, Juneteenth, Indigenous Peoples Day, and Veterans Day) closes the permit office but does not stop a move already in progress under a valid permit. Any overlimit permit requested for Sunday travel in July or August, or for movement on any holiday throughout the year, requires pre-clearance from MaineDOT's Traffic Engineering Division before the permit issues.

The overweight-only exception is worth knowing: a vehicle permitted solely for excess weight that can move with the normal flow of traffic may run at any hour, day or night. The daylight restriction does not apply to it.

Adverse weather stops all overlimit movement regardless of the clock. No load may move when visibility is poor or the highway is dangerous due to rain, snow, slush, ice, or any other condition the issuing authority or a State Police officer deems unsafe; postings on the 511ME system (www.newengland511.org) constitute formal notice. On the Maine Turnpike specifically, overlimit loads are not permitted when Turnpike speeds are reduced to 45 MPH. On the Interstate system more broadly, a permitted vehicle must exit the traveled way (at the first ramp, rest area, or weigh station) if speeds are reduced to 45 MPH. Maine does not impose metro rush-hour curfews on permitted loads, and no continuous 24-hour movement is available for any standard overlimit load type.

Several commodity categories in Maine operate under rules that differ meaningfully from the general overlimit framework.

Tree-length logs carry the most significant length relief. A tractor-semitrailer combination hauling tree-length logs may move without any permit at all if the overall length (truck, trailer, and load combined) stays at or under 74 feet, the rear overhang stays within 8'6", and no more than 25% of the log length extends beyond the trailer body. With a permit, the overall length ceiling rises to 80 feet and the rear overhang may reach 40% of the log length. Any rear load extension beyond 4 feet must be marked with a 12" x 12" fluorescent cloth flag; at night, a red light and red reflector visible from 200 feet are also required.

Timber harvesting equipment gets a narrow nighttime transport window in March and April only. Moves between sunset and sunrise are allowed during those months if the air temperature is at or below 32°F, the ground is solidly frozen with no standing water, the load is no wider than 11'6" and no longer than 75 feet, two qualified pilot vehicles accompany it, two-way communications are maintained throughout, and flashing amber beacons mark the load extremes.

Utility poles receive a straightforward permit exemption: distribution poles being moved from a staging area to their final installation point, and transmission poles of any length in emergency situations, do not need an overlimit permit for overlength.

Oceangoing containers (sealed exported containers loaded in Maine and sealed imported containers meeting the raw-materials/export test) are treated as non-divisible loads and must remain sealed throughout the route.

Stinger-steered autotransporters may run up to 80 feet overall on the National Network, and tow-away saddlemount combinations may run up to 82 feet on the National Network. Both are legal-length operations on NN routes without a length permit.

Heavy cranes (5-axle, 110,001 to 130,000 lbs) face specific bridge-crossing requirements at bridges posted for 5 MPH travel: the crane must be accompanied by either a rear pilot vehicle, an impact attenuator on the crane or follow vehicle, or a "VEHICLE STOPS WHEN FLASHING" sign wired into the brake system.

Maine's top tier is called an Extreme load. The state defines "Super Load" as meaning exactly the same thing, so the two terms are interchangeable. A load is presumptively Extreme if it meets any one of five criteria: overall length at or above 125 feet, height above 15 feet, width at or above 16 feet, gross weight at or above 160,000 lbs, or a 5-axle crane exceeding 130,000 lbs. These are presumptive, not absolute: the issuing authority may classify a load as Extreme at lesser dimensions based on local conditions such as route geometry, pavement width, shoulder conditions, traffic volume, utilities, or railroad crossings.

Weights exceeding the standard per-axle permit table (roughly everything above 177,000 lbs on an 8-axle combination, with specific caps by axle configuration) are considered Extreme and trigger a detailed engineering review. Applicants should allow a minimum of two to five business days for MaineDOT and/or the Maine Turnpike Authority to complete that review before the permit issues. Single-trip permits generally cannot be obtained more than 10 days in advance, so the planning window for an Extreme load is tight: the engineering review lead time needs to be built into the start-date calculation.

Loads that are 20 feet wide or wider, or 150 feet long or longer, carry additional requirements. Utility companies and town departments must be notified in advance. Movement is restricted to periods of clear visibility only, and the load may not travel during commuter hours or school bus hours. When overall length reaches 150 feet or more, the permittee is also responsible for public outreach: a press release and notification to affected municipalities before the move.

There is no separate height-triggered Extreme process beyond the >15' classification and its pole-escort requirement; height alone does not add the notification or commuter-hours restrictions unless the load is also ≥20' wide or ≥150' long. Maine does not publish a fixed application form unique to Extreme loads beyond the standard overlimit permit application (MV-226 through MoveMEMaine.com), but the engineering review and the increased escort requirements are automatic triggers once the Extreme thresholds are met.

Maine does not have a codified route-survey process that mirrors some other states' formal pre-permit survey requirements. Instead, its engineering review obligation is the functional equivalent for heavy loads, and a broader discretionary authority applies to all overlimit moves.

The engineering review is triggered when gross weight exceeds the per-axle permit table maximums (Extreme weight classification) or when the issuing authority determines a review is necessary on any Extreme-dimension load. That review is performed by MaineDOT and/or the Maine Turnpike Authority; the applicant does not self-certify or retain a private engineer. The department conducts the structural analysis and the permit does not issue until it is complete. The two-to-five business day review window is the minimum; complex routes or sensitive structures may take longer.

Railroad grade crossings carry a specific obligation regardless of load classification. If the permitted vehicle or load has less than 10 inches of underclearance over the rail, if police escort is required for the move, or if the vehicle cannot maintain 10 MPH through the crossing, the permittee must contact the relevant railroad to coordinate the crossing. A route review may be required as part of that coordination.

For loads at or above 20 feet wide or 150 feet long, the notification requirements (utility companies, town departments, and for loads ≥150', municipal press release) serve as a de facto pre-move route-clearance step, since those notifications need to be completed and the issuing authority satisfied before travel is authorized.

Separately, moves on Sundays in July and August, and on holidays year-round, require pre-clearance from MaineDOT's Traffic Engineering Division before the permit is issued, effectively a route-clearance review tied to timing rather than dimensions. Travel in areas where fairs or festivals are occurring may also preclude permit issuance; applicants must allow at least two working days for that clearance.

Beyond these specific triggers, the issuing authority holds broad discretion to require additional conditions or review on any permit to protect public safety, public infrastructure, or to mitigate traffic impact. There is no fixed dimension at which a carrier-performed physical route survey is required; that obligation does not exist in Maine's framework the way it does in some states. The state-performed engineering review and the notification requirements carry the structural and utility-clearance burden.

Maine's law-enforcement escort rules are codified in statute, with exact dimensional breakpoints that automatically trigger police accompaniment. A load 125 feet or more in overall length, or 16 feet or more in width, may not move without a police escort. That is a hard statutory rule, not a discretionary call. From there the requirements scale:

- Width 16' to 19'11": one police officer plus one civilian pilot vehicle - Width 20' or more: two police officers plus one civilian pilot vehicle - Length 125' to 149'11": one police officer plus one civilian pilot vehicle - Length 150' or more: two police officers plus one civilian pilot vehicle - Rear overhang more than 15': one police officer plus one civilian pilot vehicle

Extreme weight loads (at or above 160,000 lbs) do not have a fixed police trigger; weight-based police escorts are at the issuing authority's discretion.

The agency that provides police escort depends on where the move travels. On the Interstate highway system, the escort must be Maine State Police; county or municipal officers may not escort a load on the Interstate. For moves confined to a single county on non-Interstate roads, the county sheriff or local municipal police department may provide the escort. Whenever the route crosses more than one county, Maine State Police must be used regardless of whether Interstate travel is involved.

Permittees must contact the police agency directly; this is not arranged through the permit office after the permit issues. For Maine State Police escorts, three working days of advance notice is required, so plan the escort appointment before the permit's start date is finalized. The Chief of Maine State Police (at the rank of Lieutenant or higher) has authority to waive the requirement for a second police unit where two are otherwise required, or to require additional officers beyond the codified minimum, but the statutory floor of one officer for loads ≥16' wide or ≥125' long cannot be reduced.

The Bureau of State Police sets a fee for State Police escorts to recover costs; county sheriffs and municipal departments may also establish their own escort fees. Permits are available through MoveMEMaine.com, but police escort appointments must be made separately and directly with the relevant agency.