The coverage offered in liability policy differs from the comprehensive policy. While liability plan only covers third-party liability, the comprehensive one covers you for the damages to the vehicle and the owner which is called as Personal Accident Cover. The limit varies from plans to plan. Moreover, additional add-on benefits are also offered by some auto insurance plans. So, it is necessary to check and compare this trait to decide the personal accidental cover along with the additional coverage, if any under the same auto insurance plan.