Walker calls them "connection-activated civic squares", and the challenge as he sees it is the ability to activate the public space with people moving on and off transit while avoiding the potential for empty, deactivated spaces at night:
"It was quickly clear from the reader suggestions that really large connection-activated squares have to be in pretty big cities. Even there, size can be a problem. "
For examples, Walker looks at Place Bellecour in Lyon, Berlin's Alexanderplatz, and Syntagma Square in Athens.
