Sky People, Grounders, Mountain Men, and Sanctumites use various modes of transportation. The Sky People had trucks and a rover. While Grounders rarely used technology, a few groups used boats. Most Grounders, such as those of Azgeda and Trikru, were commonly seen riding horses. The Sanctumites use motorcycles.
The trucks most likely belonged to the Mountain Men, due to there being a logo on the canvas. The trucks were used to bring people in and for scouting missions.
The rover is an a vehicle used by the Sky People. The rover has a mounted gatling gun on it, making it a defensive piece of equipment. The minigun is mainly used in Season 5 against the Eligius prisoners.
After the Second Nuclear Apocalypse, Clarke finds the rover buried in sand. During the next six years, she and Madi use the rover for transportation and shelter. It is used throughout Season Five, before the engine gets shot in the final conflict of the Battle for Eden. It is left behind on Earth, during the Damocles Event.
On Sanctum, the inhabitants have motorcycles. As said by Blythe Ann and Ryker, they kept the motorcycles running since the time they were first dropped off. Motorcycles are repaired at the machine shop. Settlers use refined ethanol derived from earth corn as fuel for the bikes. While Clarke didn't know how to ride one, she was able to take the knowledge from Josephine Lightbourne's mind after stealing Jade's motorcycle. She subsequently crashed it due to the dizziness her deteriorating condition caused.
In the lighthouse bunker on Becca's Island, there were some motorcycles.
This land vehicle was used by Mission Team Alpha for transportation. In Sanctum, the vehicle is still there, next to the Machine Shop, as seen in the background. It also has an Eligius Corporation logo on it.
Emori and her brother, Otan, own a larger boat which they used to pick up Murphy, Jaha, and Gideon from the island. Unknown to Murphy, Jaha's backpack contains A.L.I.E. They use the boat to travel to an unknown location. Later, Murphy and Emori escape on the boat, abandoning Jaha and Otan.
Horses are commonly ridden by Grounders as a mode of transportation, as they do not use much technology. Members of Trikru and Azgeda are seen riding horses, though the majority travel by foot. Floukru don't have any horses on their rig, but it is unknown if they use them to travel on the mainland. Skaikru have acquired a few horses and some members, such as Clarke, Octavia, and Raven, have learned to ride. Horses are also used for trade. In Many Happy Returns, Osias traded Thelonious Jaha to the Grounders for a horse.
A Rocket called Vesta IV, was owned by Becca and her team on Becca's Island. It was later used by Raven Reyes, Bellamy Blake, John Murphy, Monty Green, Echo, Harper McIntyre and Emori to go to the Go-Sci Ring to escape Praimfaya. It was also used to take them to the Eligius IV ship and to take them back down to Earth.