Administradora Boliviana de Carreteras planned to develop El Sillar Highway Project, in Bolivia. Sinohydro Bureau 11 Co Ltd was the EPC contractor. The project covered the construction of 30.1 km highway. The dual carriageway was being built with four 7m-wide lanes. There were 28 bridges, one of which was a-153.29 m-bridge, and 2 tunnels which were 1025 m and 765 m separately. The section of El Sillar located between kilometres 100 and 128 of the Cochabamba - Santa Cruz route forms part of the East-West Bioceanic Corridor and crosses a number of towns belonging to Chapare Province in Cochabamba Department. This section has rocky slopes during the rainy season, as there are frequent rockfalls onto the road. This improved route would boost connectivity for Bolivia, speeding transport between its eastern and western borders, becoming a main part of the interoceanic corridor.