The URBIMM project relies on to explain differences and similarities in urban migration infrastructures across four European transit hubs: Brussels, Rotterdam, Thessaloniki, and Trieste.

These four cities were selected because of their geographical location along prevalent irregular migration routes, the number of undocumented migrants, and the varying local institutional contexts.

In comparing these cities, we explore variations in urban migration infrastructures in terms of their (a) relative orientation towards entry, transit, settlement and exit depending on their geographical location along irregular migration routes and (b) degree of formalization depending on the local institutional context.