Auto premiums have risen even where crash frequency has not. The pressure comes from what a repair costs once a collision happens.
Severity and frequency move independently
An insurer's claim cost is frequency multiplied by severity. Automatic braking, lane keeping and similar systems have reduced how often collisions occur, particularly the low-speed impacts that used to dominate claim counts.
Severity has moved firmly in the other direction, because the same technology raises the cost of every repair that is still needed after a crash the system did not prevent.
A smaller number of much more expensive claims can raise total cost even as roads get safer, and that arithmetic is what shows up on a renewal notice.
Sensors turned bumpers into electronics
Cameras, radar units and ultrasonic sensors are mounted in bumpers, mirrors and windscreens, which are precisely the parts damaged in the minor impacts that make up most claims.
Replacing a bumper now means replacing or transferring the sensors housed within it, and a windscreen carrying a forward camera is no longer a commodity part.
A low-speed impact that once required paint and a panel can now require electronic components and specialist labour costing many times more than the bodywork itself.
Calibration is a separate job
Driver assistance systems must be recalibrated after certain repairs, sometimes in a controlled space with manufacturer targets set at measured distances and specific lighting conditions.
Not every body shop can perform that work, so vehicles are sublet to specialists, which adds transport time, scheduling delay and a second invoice to a single repair.
Calibration appears on repair estimates as a line item that did not exist a decade ago, and it applies even where the visible damage was slight.
Repair capacity and parts supply set the rest
Technician shortages and parts availability lengthen repair times, and longer repairs mean longer rental periods paid by the insurer under loss-of-use coverage.
Rental days are a real claim cost even though they buy no repair, and they scale with the delay rather than with the damage.
Where parts are constrained, insurers face higher part prices and longer loss-of-use exposure on the same claim.
Total loss thresholds shift with used car values
A vehicle is written off when repair cost approaches its value, so identical damage can be repairable or a total loss depending on the used market.
When used values rise, more cars are repaired, and repairing an expensive vehicle costs more than settling a cheap one.
Premiums respond to that mix, which is why rates can move without any change in an individual driver's record.