Aciliu Viaduct, Steel road bridge in Aciliu, Romania.

The Aciliu Viaduct is a steel road bridge near Aciliu that stretches across a valley in Transylvania and crosses the landscape in a striking way. The structure is made up of several long spans that rest on massive pillars and bridge the valley below.

The Aciliu Viaduct was built as part of the 22 km Cunța–Săliște section of the A1 Motorway, a contract worth about €142 million, by Impregilo with subcontractor Collini. In 2015, structural defects and surface landslides led to the closure of the motorway segment and the re-excavation of nearby road sections to allow groundwater flow and prevent further slips.

The viaduct carries the A1 motorway between Cunța and Săliște, a 22 km section built by Impregilo with subcontractor Collini at a cost of about €142 million. Its deck uses 20 copper-bearing reinforced steel U-beams, each 55 m long and averaging 385 tonnes, welded on site from 88 sections.

The viaduct is well designed for through traffic and allows drivers to move quickly across the hilly area. The drive across the bridge itself is fairly quick and offers views of the valley and surrounding landscape.

The deck is made of 20 copper-alloyed reinforced steel U-beams, each 55 m long and averaging 385 tonnes, with the heaviest reaching 400 tonnes. The beams were welded on site from 88 sections, bringing the viaduct's total steel use to about 8,000 tonnes.