The Almö Bridge inagurated in 1960 was built to connect the island of Tjörn to the Swedish mainland. The bridge was built after a suggestion from Krupp. When it was built it was the longest arc bridge in the world. Built on a budget the bridge arc bridge type was cheap but it also had narrow roadways forcing heavy traffic to slow down. Below it was the busy shipping lane leading to the town of Uddevalla which sported a large shipyard and bulk harbor at the time.
The Almö bridge collapsed 01:30 AM the 18th of January 1980 when the bulk carrier MS Star Clipper struck the bridge arc which collapsed the main span. The roadway landed on top of the ship destroying the bridge but causing no casualties on the ship. The destroyed bridge made radio communication difficult as the Swedish pilot had to use a handheld VHF radio. Because of the ice the ship was unable to launch a boat to get to shore and warn motorists as a fog was descending on the area. 8 People died during the night as they drove over the edge until the road on the Tjörn side was closed 40 minutes after the accident. The mainland had been closed by a lorry driver who had crept up the bridge in the fog and had grown suspicious when the railing disapeared.

The bridge today

The large bridge arc foundations still exist but the bridge was never rebuilt. Instead the Tjörn bridge, a new cable-stayed bridge, was constructed in 17 months and inaugurated the following year. This bridge type eliminated the collision risk that had doomed its predecessor but also had wider lanes for road traffic.

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http://en.wikipedia.org/wiki/Alm%C3%B6_Bridge