This design is intentional, said Jeong Seong-gyun, head of autonomous driving at 42dot, the start-up responsible for the self-driving technology that is now owned by auto giant Hyundai.The bus looks a bit "like Lego" and is made of composite parts to help keep costs down and make it easy to replicate, he said.The company's goal was to make the technology low-cost, safe and easily transferable to many types of vehicle in the future, for example delivery trucks.The public can board at two designated stops after booking a free seat through an app.The ride felt "very smooth and safe", which she said made her feel proud of the technological progress the South Korean company has made."