Even the most powerful tractor unit cannot put a several-hundred-tonne load on the road by itself; legal authorisation comes first. Heavy haul permits are the approvals issued by road authorities for transports that exceed legal dimension or weight limits, protecting road infrastructure and traffic safety. Managed poorly, the permit process can leave your cargo waiting for weeks, expose you to fines or strand the convoy mid-route. Özd Global's Gebze-based project logistics team handles permit management end to end on behalf of its clients.
When Is a Permit Required?
Whether a transport needs a permit depends on four basic criteria: width, height, length and gross weight. Once the vehicle-and-load combination exceeds any of these limits, a special permit is mandatory. Axle loads can also trigger a permit requirement even when the gross weight stays within the limit. Domestically, permits are issued by the agencies responsible for road infrastructure, while municipal approval may also be needed for urban passages.
Types of Permits
- Single-trip permit: Issued for a specific load, route and date window.
- Period (blanket) permit: Valid for a set period for frequent non-standard moves with the same vehicle.
- Transit permit: Obtained separately for each country crossed on international moves.
- Special route permit: Includes additional technical assessment for bridges, tunnels or historic structures.
Documents Required for the Application
A heavy haul permits application is processed much faster when the file is complete. A typical application contains:
- Registration and technical data of the tractor and trailer
- Cargo dimensions, weight and centre of gravity
- Axle load distribution table
- The planned route marked on a map
- Loading diagram and lashing plan
- Bridge crossing calculations and engineer's sign-off where required
- The carrier's operating licence and insurance policy
For international moves, translations of the documents and, in some countries, representation by a local agent are required.
The Permit Process Step by Step
| Stage | Work Done | Typical Duration |
|---|---|---|
| Preparation | Cargo measurement, vehicle selection, draft route | 2–5 days |
| Route survey | Site visit, obstacle identification, alternatives | 3–10 days |
| Application | Submission of the file to the authority | 1–2 days |
| Assessment | Bridge calculations, roadworks check | 3–15 days |
| Conditional approval | Escort, time, speed and route conditions set | 1–3 days |
| Transport | Operation in line with permit conditions | Route dependent |
Durations vary with cargo size, route complexity and the authorities' workload. For very heavy loads, the assessment stage can lengthen because structural checks of bridges are needed.
Permit Conditions and Escort Requirements
Permits are usually conditional. Authorities set the number of escort vehicles according to the load dimensions; for very wide loads, a police escort is mandatory. Other common conditions include:
- Movement only within certain hours (typically at night)
- Reduced speed limits
- Single-lane, low-speed bridge crossings
- Suspension of the move in rain, fog or strong wind
- Lifting of overhead lines by authorised crews
Failure to comply voids the permit and leads to serious sanctions, so the driver and escort team must review every clause of the permit before departure.
Tip: Finalise the packed dimensions of your cargo before applying. If the dimensions change after submission, the process starts over and the planned date is lost.
Transit Permits on International Moves
On heavy transports from Türkiye to Europe, the Middle East or the Caucasus, every country applies its own permit regime. In some, permits are issued within days; in others they take weeks and require working with a local escort company. Özd Global coordinates transit permits through its project logistics team and overseas partners, and integrates customs clearance into the same schedule to minimise waiting time at border crossings.
Permit Costs
Permit fees depend on the country, the weight of the load and the distance covered. On top of the fees, route surveys, engineering services for bridge calculations, escort vehicles and line-lifting charges make up the total permit cost. These items should be shown separately in the project budget and clarified at the quotation stage. Özd Global itemises permit costs transparently in its road freight quotations.
Frequently Asked Questions
What happens if a heavy load is moved without a permit?
Unauthorised oversize transport can result in heavy fines, the vehicle being taken off the road and the cargo being held en route. In the event of an accident, insurance cover may also be deemed void.
Who applies for the permit?
The application is usually filed by the logistics company carrying out the move. The cargo owner is responsible for supplying complete technical details. Özd Global manages this process from start to finish on behalf of its clients.
Can a permit be postponed to another date?
Permits are valid for a specific date window. If the move cannot take place within it, a new application or an extension is needed in most cases, so production and dispatch schedules should be aligned with the permit.
In experienced hands, the heavy haul permits process becomes a predictable timeline. Share your cargo details, contact Özd Global and leave permit management to us.
