A new law, valid from November 7th 2013, states that any rider/driver caught for a traffic offense in the European Union, will have the fine sent to his address in his country. This law covers all riding/driving offenses except parking fines. Also, United Kingdom, Ireland and Denmark are the only countries exempted since they refused to sign this law. 
So far the country that a citizen was living permanently did not have the authority to sue him for a traffic offense in another country, which leaves a hint of a grey spot for the new European legislation. 
Obviously the new law requires access to a common database in EU by the traffic police, regarding vehicle type, permanent address etc…