I try to make study trips to foreign cities every year. It is important (and fun) to share knowledge and to experience a new system for yourself. Afterward, a more in-depth conversation with experts and policymakers is possible.
Legendary was the first trip to California in 2012 to see how the introduction of electric transport was going on the West Coast. The last years I have furthermore been to Germany (Stuttgart and Koln), Paris, Bilbao, London, New York and Los Angelos (USA). To, among others, bike on new cycleways in Los Angelos and try the expanded metro line (Paris).
Although the systems, languages, and cultures differ, the essential questions are the same.