Generally you just ask the contractor if he's insured, before hiring them.

Liability insurance only covers damage you did to the other vehicles, property, and persons. It does not cover any damage to your vehicle or yourself.

Towing your vehicle would only be required if it was damaged, so your liability insurance won't cover it (but the other person's liability might depending on the actual findings of fault).

If you agree to and sign a waiver of liability, and for example you are a pizza delivery guy. You waive (give up) any claims of damage to your car, even while using it on the job. If you have an accident you can not hold the company respponsible for damages to your car.

The retroactive date is the date from which coverage is deemed valid.

Retro active dates are most common in professional lines ( claims Made ) policies and indicate the beginning coverage date from which there has been no lapse.

You will not find a retroactive date on an occurrence policy

You should visit any online insurance broking company like that of Greenlife insurance broking limited. Visit gibl(.)in and you can there compare between different liability policy and can save a lot of money.

It varies according to the legislation of the country concerned.