Västerbron can be said to consist of three sections:

• Västerbron over Riddarfjärden - with two spans stretching over Riddarfjärden
• Västerbron over Pålsundet - a simple arch bridge stretching over Pålsundet
• Västerbron over Rålambshovsparken - a girderless floor construction stretching from Västerbroplan overRålambshovsparken to Drottningsholmsvägen near Fridhemsplan

The Västerbron over Riddarfjärden consists of two arches together encompassing slightly more than 600 m including the viaducts in either side. The southern arch next to Långholmen has a span of 204 m and, stretching over the navigable passage underneath, a vertical clearance of 26 m. The northern arch is smaller with a span of 168 m. This section is 24 m wide with a 19 m broad roadway flanked by 2,5 m wide pavements, dimensions applying to the other sections as well.

In 1955-56 the bridge was broadened 2 m, giving space to new bicycle lanes.

The bridge is traversed twice during the annual Stockholm marathon. It's a very popular spot for watching the New Year's Eve fireworks.

Sumber :
http://www.waymarking.com/waymarks/WMHQF2_Vsterbron_bridge_Stockholm_Sweden