A recent Brookings report found 
that just 22% of metro Detroit area jobs were accessible within a 90 minute transit ride, leaving far too many people without any real economic opportunity. In this regard, Metro Detroit ranks 73rd of the top 100 metropolitan areas.
Also, just 60% of working-age people within metro Detroit live near a transit stop.
Their recommendations: "Transportation leaders should make access to jobs an explicit priority in their spending and service decisions, especially given the budget pressures they face. Metro leaders should coordinate strategies regarding land use, economic development, and housing with transit decisions in order to ensure that transit reaches more people and more jobs efficiently."
Check out a summary of the Detroit area statistics or lots more information on the report, entitled "Missed Opportunity: Transit and Jobs in Metropolitan America."