Well, you're probably already here and assuming that you don't have a CCW, your guns need to be unloaded, in cases(actually, I think that wrapping them in newspaper even counts), and in your car's trunk. I'm not sure exactly how the law reads with SUVs, etc., but they have to be inaccessible to the driver, encased, and unloaded.
If you're transporting pistols, you're supposed to have your 'safety inspection' certificate with you, too. (When you purchase a pistol in Michigan, the local police write down the serial number and give you a certificate after you purchase it. You're supposed to have it when you transport it.)
We're currently working on getting the law changed regarding pistol transportation, and it's almost to fruition. Both the State Senate and House have passed the Vear transporation bill. The way the current law is written, you technically also have to belong to a gun club or possess a valid hunting license to tranport handguns. When this bill becomes law, this will change. Currently, in an extremely rare and unlikely case, and overzealous LEO could take your pistols if you didn't have a membership in a club, or a hunting license, or (I think) if you weren't going to the range.
Check out our web page at
www.mcrgo.org (The Michigan Coalition for Responsible Gun Owners) for a more accurate description of the pending bill.
Hope your trip here went well. If you were duck hunting, I hope you got some ducks...
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NRA Life Member/Volunteer Recruiter
Michigan Coalition for Responsible Gun Owners(MCRGO)www.mcrgo.org