DETROIT -

A new study says Michiganders are dropping big bucks on car repairs because of really bad roads.

The study comes from TRIP, a nonprofit organization that researches economic transportation data, and says 57 percent of the state’s roads are considered in “poor or mediocre” condition.

The study also calculated that the roads cost a driver in metro Detroit $1,600 a year -- for repairs and lost gas and time while stuck in traffic congestion.

In total, the study says Michigan roads costs drivers $7.7 billion.

What’s more, a total of 27 percent of Michigan bridges are in need of repair, improvement or replacement. Twelve percent of the state’s bridges are structurally deficient and 15 percent are functionally obsolete, according to the study.

Read the full study here: TRIP report on Michigan roadways