What are security implications of Thorium fueled automobiles? What if someone places an explosive device in it? Or two thorium fueled cars crash? What happens

What are security implications of Thorium fueled automobiles? What if someone places an explosive device in it? Or two thorium fueled cars crash? What happens to reactor in these cases? Is there mini Chernobyl everytime (let's say food/water is poisoned for a month or so) this car collides with something? I think things like thorium fueled cars would be way more useful for inter solar travels than as cars (Less chances of causing environmental disaster).