NerdWallet averaged rates for 40-year-old men and women for 20 ZIP codes in each state and Washington, D.C., from the largest insurers, up to 12 in each state. “Good drivers” had no moving violations on record and credit in the “good” tier as reported to each insurer. For the other two driver profiles, we changed the credit tier to “poor” or added one at-fault accident, keeping everything else the same. Sample drivers had the following coverage limits:

Once you know the approximate value of your car and the cost to carry collision coverage, then you can make an informed decision about purchasing that coverage. Many people find that it's a good idea to cover newer cars, but as cars get older, their values decrease, and you might consider omitting or dropping this coverage to save money on your auto insurance.
Each of following insurers who transact business in California are domiciled in California and have their principal place of business in Los Angeles, CA: Farmers Insurance Exchange (#R 201), Fire Insurance Exchange (#1267-4), Truck Insurance Exchange (#1199-9), Mid-Century Insurance Company (#1428-2), Civic Property and Casualty Company (#4241-6), Exact Property and Casualty Company (#4240-8), Neighborhood Spirit Property and Casualty Company (#4242-4).
Data was obtained from the Texas Department of Insurance for a thirty year old single male driver across 78 cities. He owns his car and uses it primarily for work purposes, averaging about 12,000 miles annually. Insurance policies include Texas’s minimum auto insurance liability requirements: $30,000 for bodily injury liability per person (up to $60,000 per accident), and $25,000 of property damage (30/60/25 coverage) liability insurance, 50/100/50, as well as 100/300/100. Car insurance costs are based on a 2011 Toyota Camry four-door sedan, with 2.5 liter/4 cylinder engine.
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There is a case to be made for getting just comprehensive and not collision insurance, even if your car is not valuable. Comprehensive covers you for a lot more perils than does collision--including, most importantly, against theft. Regardless of the value of your car, having it stolen is a major inconvenience. Even if your car is worth only $2,000 at the time of the theft, and your insurer gives you $1,500, that sum would go a long way in buying yourself a new vehicle. As we discuss in more detail below, comprehensive insurance generally costs no more than $200 per year, so a $1,500 reimbursement would make the coverage valuable.
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Each of following insurers who transact business in California are domiciled in California and have their principal place of business in Los Angeles, CA: Farmers Insurance Exchange (#R 201), Fire Insurance Exchange (#1267-4), Truck Insurance Exchange (#1199-9), Mid-Century Insurance Company (#1428-2), Civic Property and Casualty Company (#4241-6), Exact Property and Casualty Company (#4240-8), Neighborhood Spirit Property and Casualty Company (#4242-4).
Let's use the aftermath of Superstorm Sandy as an example to illustrate the differences between collision and comprehensive. Within that storm, let's consider two events that might have happened: 1) a heavy tree branch fell on your car, or 2) you swerved to avoid a falling tree branch and wound up crashing into a tree. In the first event, you had no control over when or why a tree branch would fall on your car. This kind of accident would get reimbursed under your comprehensive policy. In the second situation, you were driving the car and ultimately swerved into the tree, which makes it a collision, and collision insurance therefore pays for the damages. Events like the hypothetical ones stated above are why it's important to differentiate between the two types of coverage.
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