The URUP method developed and implemented by Obayashi is the world's first tunneling technology that uses a shield machine to tunnel underground through the entire length of the tunnel from entrance to exit. It enables rapid construction of road and railway underpasses. 

In comparison with conventional construction methods, the URUP method shortens the construction period by roughly two-thirds by eliminating the need for open-cut excavation and vertical shafts. It also substantially alleviates traffic congestion and noise associated with the construction work. It should contribute to reducing CO2 emissions as well.