ODC transport in India: moving over-dimensional cargo by road

Most freight is sized to fit the truck. Over-dimensional cargo is the other way round: the truck, the route and the timetable are chosen to fit the load. A transformer, a reactor vessel, a wind-turbine blade, a boiler drum or a set of heavy fabrication modules cannot be squeezed into a standard vehicle, so the work starts weeks before the move.

This guide explains what counts as ODC in India, which permissions apply, how route surveys and escorts work, which trailers fit which loads, and how the paperwork differs from ordinary freight.

What counts as ODC and OWC

Two related terms are used in India:

• ODC (over-dimensional cargo): the loaded vehicle exceeds the legal limits on width, height or length.
• OWC (over-weight cargo): the loaded vehicle exceeds permitted axle loads or gross vehicle weight.

Many project loads are both.

The legal limits

The dimensions of motor vehicles are set by Rule 93 of the Central Motor Vehicles Rules, 1989. For most goods vehicles, the headline limits are:

The rule also sets overhang limits and carries vehicle-specific provisions, and it has been amended over the years. Check the current rule text for vehicle-specific limits before planning a load near the boundary. Axle and gross weight limits are notified separately and depend on the vehicle and axle configuration.

A load becomes ODC the moment the loaded vehicle crosses any of these limits, including through projection of the cargo beyond the body.

Step 1: Define the cargo precisely

Everything that follows depends on accurate numbers. Get from the manufacturer or fabricator:

1. Dimensions of the cargo: length, width, height, and the shape (a cylinder behaves differently from a box).
2. Weight, and the centre of gravity.
3. Lifting points and lashing points, with rated capacities.
4. Support requirements: saddles, cradles, or points where the load must not bear.
5. Any orientation limits: can it be laid down, or must it stay upright?

Then add the trailer. The transport height is the cargo height plus the deck height of the trailer, which is why low-bed trailers matter so much.

Step 2: Choose the trailer

Hydraulic modular trailers are built from modules of axle lines that can be coupled to spread weight. Their hydraulic suspension keeps the deck level on uneven roads and each axle can often be steered, which helps on tight bends. They are the standard answer for the heaviest project cargo. Our which truck tool covers the more common vehicle types.

Step 3: Survey the route

Published limits and maps do not show what will stop a large load. A physical route survey does. A good survey records:

• Vertical clearances: bridges, flyovers, foot overbridges, gantries, overhead electrical and telecom lines, tree canopies
• Horizontal clearances: narrow bridges, town streets, toll-plaza lanes, dividers, sign poles
• Turning geometry: bends, junctions and ramps, checked against the trailer’s turning path
• Structures: bridges and culverts whose capacity needs checking for heavy loads
• Gradients: steep climbs and descents that affect traction and braking
• Road surface: soft shoulders, broken sections, level crossings
• Parking and holding points: where the convoy can stop safely overnight or wait for permission windows

The survey produces a route plan with every obstruction listed and a proposed solution: raise the wire, remove a divider temporarily, reinforce a culvert, or reroute. Where a structure is doubtful, the road owner may require an engineering assessment.

Step 4: Obtain permissions

National highways

The Ministry of Road Transport and Highways runs an online permission process for ODC and OWC movement on national highways, including movement on hydraulic modular trailers. The application typically needs cargo and vehicle details, the route, the survey findings and supporting documents. Allow time: permissions are not instant, and heavier or larger loads get more scrutiny.

State roads and local bodies

Where the route uses state highways, district roads or city roads, the relevant state Public Works Department and other road-owning authorities have their own permission processes. Town and city stretches may also involve the traffic police for timing and route restrictions.

Utilities and others

Moving overhead lines needs the power or telecom utility. Level crossings need the railway authority. Port and industrial estate roads have their own rules.

Our ODC permit guide lists the typical approvals by route type.

Step 5: Plan escorts and movement windows

Large loads usually move with escort vehicles that warn and control traffic ahead of and behind the convoy. Depending on the permission conditions, police escort may be required in some stretches.

Movement is often restricted to certain hours, commonly avoiding peak traffic and sometimes restricted to night movement in towns. Speeds are low. A few hundred kilometres can take many days for a heavy HMT convoy, and planners should budget for waits at bridges, utilities and permission checkpoints.

Step 6: Documents and the e-way bill

An ODC consignment carries the usual documents plus its own:

• Tax invoice or delivery challan
• E-way bill, with longer validity for ODC
• Consignment note
• Permission letters from MoRTH and each state or local authority
• Route survey report
• Vehicle documents: registration, fitness, insurance, permit
• Load securing and lifting plans where required by the project or insurer

E-way bill validity for ODC

Under Rule 138 of the CGST Rules, an e-way bill for normal cargo is valid for one day per 200 km. For over-dimensional cargo, validity is one day for every 20 km or part of it. Mark the consignment as ODC when generating the e-way bill so the correct validity applies. Validity can be extended if the move is delayed, within the window the system allows around expiry. Our GST and e-way bill guide covers extension in more detail.

Loading, lashing and insurance

• Lifting should follow a lift plan with rated cranes and rigging, and a competent supervisor.
• Lashing should be engineered for the load’s weight and centre of gravity, with chains, binders and stoppers rated for the forces of braking and cornering.
• Insurance for project cargo is usually specialised. Confirm that the policy covers the transit mode, loading and unloading, and any storage en route.

Common mistakes

• Planning on cargo dimensions without adding trailer deck height
• Assuming a highway route is clear without a physical survey
• Applying for permission late, after the equipment is already at the dispatch point
• Forgetting state and city permissions when the national-highway permission is in hand
• Generating the e-way bill without marking it ODC, so it expires days early
• Underestimating waits at overhead lines and bridges

Checklist

Before an ODC move:

• Cargo dimensions, weight and centre of gravity confirmed in writing
• Transport height calculated including trailer deck height
• Trailer type selected for weight, height and length
• Physical route survey completed, with every obstruction resolved
• MoRTH permission obtained for national-highway stretches
• State and local permissions obtained for other roads
• Utility, railway and police arrangements confirmed
• Escort vehicles and movement windows planned
• E-way bill generated as ODC, with extension plan for delays
• Lift plan, lashing plan and insurance in place

To discuss a specific load, see our ODC and project cargo service or request a quote with the cargo drawing and route.