Sheriff Matt Saxton believes the shootings were intentional and that they are all connected.
A section of I-94 in Detroit will be closed in both directions this weekend so crews can work on the M-1 Rail project.
Two motorcycles struck a Chrysler 300 that cut them off, state police said.
Authorities say a motorcyclist is fighting for his life after crashing into a vehicle on I-94 that was re-entering the freeway from the shoulder.
There were some tense moments Tuesday while police dealt with a truck dangling off the side of a freeway overpass.
Soutbound US-23 remains closed at I-94 following the Thursday afternoon crash.
Three of the vehicles involved were semitrailers, including one that jackknifed.
he big rebuild of I-94 through the heart of Detroit is going forward with work to begin as early as next year.
A section of I-94 in Detroit will be closed in both directions this weekend in Detroit so crews can work on the M-1 Rail project.
Police say the 16-year-old lost control of his car, crossed the median and caused a head-on crash that killed three people.