The traffic mix changes completely
Winter brings large recreational vehicles, towed cars and drivers navigating unfamiliar roads, in volumes the local network was not built around. The collision risk for a local driver rises without anything about their own driving changing, which is an argument about limits rather than about care.
Out-of-state drivers complicate a claim
A different insurer, different state minimums and an adjuster who is not local all slow the process. Your own collision and medical payments cover work immediately and recover later, which is usually the faster route to a repaired car.
Underinsured motorist is the quiet necessity
A visiting driver carrying their home state’s minimum can be entirely legal and nowhere near able to cover a serious injury. Your own underinsured motorist cover is the only thing that fills that gap, and it is routinely declined to save a small amount.