When an insured borrows a vehicle from a friend, the insured’s liability coverage usually steps in only when the insured’s policy limits are exceeded. Collision and comprehensive coverage do not apply to a borrowed vehicle. Medical Payments (Med Pay) and Personal Injury Protection (PIP) coverage, as we will see below, also follow the insured into a borrowed vehicle.
Farmers offers coverage for travel trailers and fifth wheel trailers in addition to RVs, as well as a special program for customers who use them as part- or full-time residences. The Stationary Travel Trailer Program offers comprehensive, liability, and medical payments coverage for customers who reside in their trailer seasonally or permanently. All of Farmers’ optional coverage options for RVs also apply for trailers. What’s more, if your trailer is towable, Farmers will insure your tow vehicle.
While an “insured vehicle” may include a friend or neighbor’s vehicle or a rental car, if the vehicle was available for regular use, it might be excluded. A “replacement” vehicle will probably be covered, but in some cases only under circumstances where the insured’s vehicle cannot be operated for some specific reason, such as a repair. Coverage might not follow anyone if the insured is driving a vehicle other than a “private passenger vehicle not owned and listed on the insured’s policy.” There really is no such thing as a standard auto policy anymore and coverage for non-owned autos will be different under some policies and non-existent under others.
In 1998, the Progressive Insurance company started a pilot program in Texas, in which drivers received a discount for installing a GPS-based device that tracked their driving behavior and reported the results via cellular phone to the company. The program was discontinued in 2000. In following years many policies (including Progressive) have been trialed and successfully introduced worldwide into what are referred to as Telematic Insurance. Such 'telematic' policies typically are based on black-box insurance technology, such devices derive from a stolen vehicle and fleet tracking but are used for insurance purposes. Since 2010 GPS-based and Telematic Insurance systems have become more mainstream in the auto insurance market not just aimed at specialised auto-fleet markets or high value vehicles (with an emphasis on stolen vehicle recovery). Modern GPS-based systems are branded as 'PAYD' Pay As You Drive insurance policies, 'PHYD' Pay How You Drive or since 2012 Smartphone auto insurance policies which utilise smartphones as a GPS sensor, e.g. . A detailed survey of the smartphone as measurement probe for insurance telematics is provided in 
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