A consortium of southeastern Michigan governments has endorsed a $2.3 billion plan to widen two stretches of Interstates 75 and 94 serving Detroit and its suburbs.

The commission of the Southeast Michigan Council of Governments voted 24-7 Friday to proceed with plans to add lanes to I-94 north of downtown Detroit and I-75 in the city's northern suburbs.

Supporters say the work is needed to loosen traffic bottlenecks, while opponents say it would damage neighborhoods through which the highways travel.

Michigan Department of Transportation spokesman Rob Morosi tells MLive DOT com the earliest work would begin no sooner than 2016 on I-75 and 2018 on I-94.

 I-94 would get extra lanes between Conner and I096, while I-75 would get them from Eight Mile Road to Michigan 59.