A car hit my tree — what should I do?

Bark scraped or torn off one side down to pale wood, sometimes with a flap still hanging. A gouge or a split running up or down from the impact point. Paint, plastic, or chrome embedded in the wound. Soil pushed up or cracked on the side away from the impact, and turf torn at the base. The tree standing at a slightly different angle than it did. Weeks later, sap or dark wet staining running down from the wound. The living tissue that moves water up and sugar down is a thin layer immediately under the bark, so a wound that looks like a scrape can still have killed a wide strip of the tree's plumbing. One crash produces two separate questions: whether the tree survives the wound, and whether the impact cracked the stem or loosened the tree in the ground so it may come down. The second question is the one that matters this week; the first plays out over years.