** I would say whenever the cost of insurance out weighs the value of the
** vehicle.
**
** Kate
Statistically, if the yearly premium for comp/collision is more than 10X the value of the car, it is cheaper for you to 'self-insure' yourself by not paying the ins. premiums. (I use high book for the value.)
For example, if you're paying $500/yr. for comp/collision coverage, you should seriously consider dropping it when the value of the car drops below $5000. At this point, the odds of collecting back what you will pay over the next several years is slim at best.
Of course, if you're a drunken dufus who often runs into trees, keep the coverage...if you can get it to begin with. :)