Tel, this is about officaly registered road cars whatever their age, don't you think so? But OK with you, if a classic road going car is written off, its value might be effected because you can't use it on the road anymore. At least for a while. We have something here called "Carte Grise de Collection" aka CGC allowing us to register a classic hence some exemptions (MOT, insurance…).
https://officecartegrise.com/registr...nd-collection/