The principal use
‘The principal use’ is the application of automobiles in a way that looks as a man has adopted and is essentially covered under the insurance policy.
Normally Insurer have to choose an appropriate insurance type which suit the automobiles and principal use, If that automobile is always in use whatever in pick up or drop off and goes out of town often, then choosing first class insurance that covers everything is the most suitable way since it's worth the risk.
But if that automobile hasn't been use much like someone who normally uses public car services, choosing the third class car insurance is the most suitable because the chances of car clash is low since there's not much uses.
Choosing your car insurance by using The principal use is one of the best way, because if the car clash happen you will have an insurance to take part of the risk.