There's absolutely no difference in the level of safety. You can see some safety maps from SEMCOG
here. The road segment between 96 and the lodge, with all it's crazy overpasses, left exits, crumbling pavement, and "insufficient" acceleration and deceleration lanes is rated low crash risk. The rest of i-94 in the city is rated as medium.
Of course, driving is incredibly dangerous--for those aged 2-35[[ish), it is the most likely cause of death. For a young fellow like myself, it seems like the best way to stay alive is to avoid the car [[which I managed to do for years living in the city).
As for congestion, what better way for a government to promote transit than traffic jams?
Clever people tend to get what they pay for. Unless they listen to traffic engineers, in which case they pay thousands
of thousands
of thousands of dollars and get the same thing they started with.