Roll-on/Roll-off (RoRo)

Picture a ferry, but scaled up to handle thousands of vehicles at once. That’s the basic concept behind Roll-on/Roll-off shipping. Instead of using cranes to lift cargo into the hold of a container vessel, RoRo ships have built-in ramps that let wheeled cargo drive on at the origin port and drive off at the destination. Cars, trucks, tractors, construction equipment, and even military vehicles move across oceans this way every day.

How RoRo Ships Are Built

RoRo vessels are fundamentally different from container ships in their interior layout. A container ship stacks boxes in a grid, maximizing vertical space. A RoRo ship has multiple internal decks connected by ramps, almost like a floating parking garage. The decks are adjustable on some newer vessels, allowing operators to change the clearance height to accommodate everything from sedans (which need about 1.6 meters) to heavy machinery (which might need 5 meters or more).

The largest pure car and truck carriers (PCTCs) can hold over 8,000 standard vehicles. The Höegh Target, one of the biggest in its class, has a capacity of about 8,500 car equivalent units. These ships are enormous, often stretching 200 meters long, yet they operate with relatively small crews of 20 to 30 people because the cargo handling process is so streamlined.

Loading happens quickly compared to container operations. Professional drivers board the ship and park vehicles bumper to bumper across the decks. A well-organized terminal can load a full PCTC in under 24 hours. Breakbulk cargo that can’t roll on its own gets placed on flatbed trailers called MAFIs, which are then towed aboard by terminal tractors.

When RoRo Makes Sense (and When It Doesn’t)

RoRo is the default method for shipping vehicles internationally. If you’re importing cars, motorcycles, boats on trailers, or heavy equipment, this is almost certainly how they’ll cross the ocean. The per-unit cost for vehicle shipping via RoRo is substantially lower than containerizing the same vehicle, which would require blocking, bracing, and a container booking that wastes space around the vehicle’s irregular shape.

For general ecommerce merchandise, though, RoRo isn’t relevant. Your cartons of products from a factory in Guangzhou will move in containers on a container vessel or possibly as LCL freight consolidated with other shippers’ goods. RoRo and container shipping serve different cargo types and rarely overlap.

There’s a hybrid category worth knowing about: ConRo ships carry both containers on deck and rolling cargo below deck. Some trade lanes, particularly those connecting smaller ports with less container infrastructure, use ConRo vessels. If you’re shipping to Caribbean or African markets, you might encounter ConRo service.

RoRo and the Auto Industry Supply Chain

The automotive industry depends on RoRo capacity. When COVID disrupted global shipping in 2020 and 2021, automakers couldn’t get finished vehicles to dealerships fast enough. New RoRo vessel orders surged, but these ships take two to three years to build. The order book through 2026 added significant new capacity, but demand kept pace as global vehicle production recovered.

Seasonal patterns affect RoRo pricing. The end of a model year in the U.S., usually late summer, coincides with high demand for transporting new model-year vehicles from manufacturing hubs in Japan, South Korea, and Germany. Rates tend to climb during these windows.

Why Ecommerce Sellers Should Know This Term

Even if your products don’t ship RoRo, understanding the term matters for two reasons. First, if you ever expand into selling vehicles, heavy equipment, or large motorized goods, you’ll need to work with RoRo carriers and the specialized freight forwarders who book on them. Second, RoRo vessels compete for port berth space and labor with container operations. At congested ports like Long Beach, a surge in RoRo traffic can affect container terminal throughput and your delivery timelines indirectly. Sellers who work with a 3PL located near major port complexes get real-time visibility into these congestion patterns, which helps with planning replenishment cycles around delays you’d otherwise never see coming.