Its great to see Bilbao adopting a 30kmh (18.5mph) limit for most streets.
The following is taken from the Red de Cuidades por la Bicicleta website and has been translated by Google Translate
Welcome to the new area of the website that we have for those in countries using km/h for speed limits. Of course lower speeds in communities is not just becoming a UK standard. Other countries and places around the world have already or are adopting a 30km/h (18.5mph) limit as default for their urban and village streets.
We now have local campaigns in USA in mph but also Ireland and Canada in kmh. Whilst there are legal jurisdictions that are different in each country the benefits of lower limits and vehcile speeds for residential and urban streets are the same across the world. As our campaign grows we expect to see many more local campaigns syaing the 20 is Plenty in mph or how they Love 30 in kmh.