Sosrobahu

[2] One day, Tjokorda was working on his 1974 Mercedes-Benz, which he had jacked up so that the back two wheels were supported on the slippery floor of the garage where some oil had been accidentally spilled.

Tjokorda conducted trials with cylinders 20 cm in diameter converted into a hydraulic lift and loaded with 80 tonnes of concrete.

[3] After the trials, Tjokorda finalised his design called the LBPH (Landasan Putar Bebas Hambatan; Free Moving Platform[3]) which consisted of two concrete discs with a diameter of 80 cm enclosed in a container.

A rubber seal around the edges of the plates protected against the oil escaping under the high forces experienced during the lift.

[3] In the 1980s, a construction company, PT Hutama Karya, was granted a contract to build a highway above Jalan A. Yani.

Elevated toll road on Jalan Ahmad Yani by pass, Jakarta, Indonesia . The elevated road used the Sosrobahu construction technique that rotates the beam-supporting bar on each pylon.