Every state that requires auto liability insurance sets a minimum amount. Those figures were written to establish a floor rather than to cover a serious accident, and the gap has widened over time.
The minimum is expressed as three numbers
Liability limits are quoted as bodily injury per person, bodily injury per accident, and property damage. Each is a separate ceiling on what the insurer will pay.
The per-person figure caps what any single injured party can recover, while the per-accident figure caps the total across everyone injured in that event.
Property damage covers the other party's vehicle and any structures hit. It does not cover the policyholder's own vehicle, which requires collision coverage.
The numbers were set long ago
Many statutory minimums were established decades in the past and are updated only when a legislature acts, which happens rarely and unevenly.
Meanwhile vehicle repair costs have climbed as bodies became more complex and sensors were embedded in bumpers, mirrors and windshields.
Medical costs have risen on their own track. A single hospital admission after a highway collision can exceed a minimum bodily injury limit without difficulty.
Exceeding the limit exposes the driver personally
When damages exceed the policy limit, the insurer pays up to that limit and the remainder is the policyholder's responsibility as a personal debt.
An injured party can pursue that balance through a civil claim, and judgments can attach to assets and, in some states, to future wages.
This is why higher liability limits are usually inexpensive relative to their protection. The severe claims that exhaust a limit are rare, so the additional premium is small.
Uninsured motorist coverage addresses the mirror problem
Carrying high limits protects others from the policyholder. It does nothing when the at-fault driver is uninsured or carries only a minimum policy.
Uninsured and underinsured motorist coverage fills that gap, paying the policyholder's own injury costs when the responsible party cannot.
Some states require it, some require insurers to offer it with a written rejection, and some leave it entirely optional, which is why coverage patterns vary regionally.
Minimum coverage is a legal test, not a financial one
Meeting the state minimum satisfies the registration and traffic-stop requirement. It is evidence of financial responsibility as the statute defines it.
Whether it is adequate depends on the assets and income the driver would need to protect, which the statute makes no attempt to consider.
Drivers with little to lose and drivers with substantial assets face the same legal requirement and very different practical exposure above it.