General Liability Insurance provides:

This is coverage for an insured when negligent acts and/or omissions result in bodily injury and/or property damage on the premises of a business. Also provides coverage when someone is injured in the general operation of a business such as a pilot or escort car business. All General Liability policies exclude Professional Liability.

In the normal operations of a pilot or escort car business, (not including route surveys or height pole work) you could be accused of being negligent in the operations of your business.  This policy would provide defense costs for this exposure.  General Liability would be your basic coverage to protect you.  Usual required limits are $1,000,000