  The travel costs of the players (travelers) in anonymous congestion games
depend on their choices of routes and also on the states of the transportation
network such as incidents, weather, and road work. In this extended abstract,
we consider an incomplete-information environment in which the realizations of
the states are unobserved by the travelers. We study how a planner can
incentivize the travelers to behave in her favor by strategically designing
what and how the travelers get informed about the realizations of the states.
