DETROIT -

If you're heading to downtown Detroit this weekend, you'll want to know about some road closures and alternative routes.

Eminem and Rihanna have two shows at Comerica Park -- Friday and Saturday nights. On top of that, the Detroit Lions have a preseason game Friday night against the Jacksonville Jaguars at Ford Field.

About 100,000 people are expected to converge on downtown.

Meanwhile, there is the ongoing M-1 Rail construction project which has shut down a portion of Woodward Avenue.

So, expect some traffic backups. However, knowing where to go and where not to go will help a lot.

Road closures:

-- Woodward Avenue has lane closures between Mack and Adams
-- Woodward Avenue is closed between Adams and Campus Martius for M-1 Rail construction
-- Madison Street has a curb lane closed

The Michigan Department of Transportation offers these alternate routes:

-- Grand River
-- Randolph
-- Washington

Click on the markers on this map for details.