TL;DR: RoRo means your car is driven onto a vehicle carrier and driven off at the destination. It is normally cheaper than a container for one or two cars, but the car is exposed and you cannot ship parts inside it.
RoRo (roll-on / roll-off) vessels are floating car parks. The vehicle is driven aboard under its own power, lashed to the deck, and driven off at the destination port. No packing, no container, no stuffing charges.
When RoRo makes sense: one or two cars, on a route with regular vehicle-carrier service to a port that handles RoRo. Tema and the Lagos terminals both do. Per-unit cost is usually lower than a container for small volumes, and clearance is straightforward because the car arrives as a vehicle rather than as container cargo.
When a container is better: three or four cars, which is where a 40-foot container usually beats RoRo per unit. Containers also protect the paint from salt and handling damage, and let you ship spare parts, tyres or accessories in the same box. If theft of mirrors, badges and wheel caps is a concern at your destination port, a sealed container removes that exposure.
What RoRo requires: the car must drive, steer and brake. A non-runner cannot go RoRo. Fuel is normally restricted to a quarter tank or less, and personal effects cannot be left in the vehicle — port authorities will remove or refuse them.
We book whichever suits your order and quote both when the volume is near the break-even point. Ask for both numbers before you decide.