If they're carpenter bees, you'll find bore holes in the underside of the solid wood members of your carport. They always seem to drill up from the bottom surface. I guess this keeps the rain out? All the sites say a carpenter bee is only about one inch long. Yours are 2 - 3 inches long?

Carpenter bees:
http://ohioline.osu.edu/hyg-fact/2000/2074.html
http://www.uky.edu/Agriculture/Entomology/entfacts/struct/ef611.htm

Can't you park your car somewhere else for a couple days until you get rid of these beasts?

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