On (a) Sunday, I throw a bike in the back of a truck, and it doesn’t matter if it’s a dirt road, if it’s a sand trail, if it’s a cliff, if it’s a highway. Whatever it is, I can make it my own experience.
It can mean either of those.
Looking at the video footage it would appear to be a motor bike in this instance.
There could be a number of reasons for travelling by truck in the first instance. Perhaps he is taking it a considerable distance, so makes the main part of the road journey by truck for comfort, perhaps the bike is a bike specifically intended for off road use and not licensed for use on the road, etc.