Hazelbaker says many companies prefer to limit their exposure with exotic cars like Dodge Vipers and Lamborghini Diablos. Some safety feature discounts are disappearing. Now that dual-front air bags are standard on cars, many companies no longer give a discount for them on the newest models. Side-impact air bags are optional or standard on some vehicles, but Hazelbaker is not aware of any discounts for them. Other features auto makers promote for crash-avoidance safety, like traction control and stability control, don't yet qualify for discounts.
Individual states regulate insurance companies.
That means it isn't always easy to make general comparisons in an overview like this. Some states require discounts for various forms of anti-theft devices, with immobilizing features receiving the most reduction. Remember, several separate coverages make up an auto insurance policy. Discounts apply only to a specific coverage, not to the premium as a whole. That's at all price levels of vehicles.