Insurance Co. says car must be in a locked garage

I have American Collectors and never heard of the part where a car needs to be stored inside.....
Here in CT. If a car is over 20 years old it can get collector car plates. Over 25 they are antique plates. Both take car off normal property tax rolls and drop value to $500 which means about $15 dollars a year on property taxes vs. a couple of hundred. (Yes CT is tax haven) . It is also a reason for a person to insure as a classic car. But people where driving their 89 Square body Chevrolet or their 1986 Toyota As every day drivers. The state was losing revenue, and ALOT more insurance claims on cars not really a collector. Also these cars were being parked on side of the road or on a dirt driveway. Not the way a true collector car should be kept. Cheap insurance for low mileage driven cars was costing insurance companies a lot. So by instituting a few stipulations they prevent an old car from receiving the Benefits of “classic car” status.