How Do Crash Safety Ratings Work?

Crash safety ratings work by testing how well a vehicle protects people in common crash situations, then turning those test results into stars, scores, grades, or safety awards shoppers can compare.

Top 3 Takeaways

• A 5-star safety rating usually means a vehicle performed very well in government crash testing, but you should still compare the individual crash categories.
• NHTSA and IIHS use different testing systems, so it is smart to check both before choosing a vehicle.
• Compare vehicles by class, size, model year, trim, and safety features instead of looking at one overall score by itself.

What Do Crash Safety Ratings Actually Tell You?

Crash safety ratings help answer one big question: how well is this vehicle designed to protect you and your passengers if something goes wrong?

These ratings are based on controlled crash tests, rollover evaluations, and crash prevention technology testing. They do not predict every real-world accident, but they do give shoppers a useful way to compare vehicles before buying.

In the United States, the two names you will usually see are NHTSA and IIHS. NHTSA is the federal agency behind the 5-Star Safety Ratings program, while IIHS is an independent safety organization known for ratings like Good, Acceptable, Marginal, Poor, Top Safety Pick, and Top Safety Pick+. NHTSA

What Do NHTSA Safety Stars Mean?

NHTSA uses a 5-star rating system to help shoppers compare crash protection and rollover safety. One star is the lowest rating, and five stars is the highest rating. NHTSA

The NHTSA rating is often the easiest one for shoppers to understand because it looks simple at first glance. More stars usually mean better crash performance in that specific test area.

However, the overall star rating is not the only number you should check. You should also look at frontal crash, side crash, and rollover results separately.

NHTSA Rating	What It Generally Means
5 stars	Strong safety performance in that test category
4 stars	Good performance, but not the highest score
3 stars	Average or moderate performance
2 stars	Below-average performance
1 star	Lowest performance in that category

NHTSA’s program evaluates vehicles in frontal crash, side crash, and rollover testing because those crash types represent many of the serious crashes drivers face on the road. NHTSA

What Do IIHS Scores Mean?

IIHS uses a different system than NHTSA. Instead of stars, IIHS often uses ratings like Good, Acceptable, Marginal, and Poor.

A Good rating is the best result. A Poor rating is the lowest result.

IIHS also gives annual awards called Top Safety Pick and Top Safety Pick+. These awards are designed to identify strong safety choices within vehicle size categories for that year. IIHS Crash Testing

IIHS Rating	What It Means
Good	Best performance
Acceptable	Solid, but not top-level
Marginal	Some concerns in that test
Poor	Weakest performance
Top Safety Pick	Strong safety award for that model year
Top Safety Pick+	Higher-level safety award with tougher requirements

For 2026, IIHS Top Safety Pick+ criteria include Good ratings in key crash tests, acceptable or good headlights, good pedestrian front crash prevention, and acceptable or good vehicle-to-vehicle front crash prevention 2.0. IIHS Crash Testing

Is NHTSA or IIHS More Important?

Neither one should be ignored. NHTSA and IIHS are both useful because they test vehicles in different ways.

NHTSA is helpful for understanding government crash test results, especially the familiar 5-star rating. IIHS is helpful because it often looks closely at crash structure, headlights, crash prevention systems, and safety performance by category.

The best approach is to check both. If a vehicle performs well with NHTSA and IIHS, that gives you more confidence than relying on one rating alone.

How Are Crash Tests Performed?

Crash tests use crash-test dummies, sensors, controlled speeds, barriers, and repeatable test conditions. The goal is to measure how much force reaches different parts of the body during a crash.

For example, NHTSA’s frontal crash test uses belted crash-test dummies and a fixed barrier at 35 mph. The test is meant to represent a crash between two similar vehicles of the same weight. NHTSA

Side crash tests look at how well the vehicle protects occupants when another vehicle strikes the side. Rollover testing looks at how likely a vehicle is to tip or roll in certain conditions.

These tests cannot cover every possible crash. Still, they are valuable because they give shoppers a consistent way to compare vehicles under controlled conditions.

What Is an Overall Safety Rating?

An overall safety rating is a combined score based on multiple test areas. It is useful, but it should not be the only thing you look at.

A vehicle might have a strong overall rating but perform slightly lower in one specific category. For example, a model may do very well in side crash testing but have a lower rollover score.

That matters because your driving situation may make one category more important than another. A commuter may care most about frontal and side-impact protection, while an SUV buyer may want to pay close attention to rollover resistance.

Can You Compare Safety Ratings Between Different Vehicles?

Yes, but you need to compare fairly.

The biggest mistake shoppers make is comparing two vehicles from totally different classes as if they are the same. A compact sedan and a full-size SUV are built differently, weigh differently, and may behave differently in a crash.

NHTSA says frontal crash ratings should only be compared with vehicles from the same weight class, within plus or minus 250 pounds, because the test represents a crash between two similar-weight vehicles. Side crash and rollover ratings can be compared across classes. NHTSA

Fair Comparison	Why It Makes Sense
Midsize sedan vs. midsize sedan	Similar size and weight
Compact SUV vs. compact SUV	Similar vehicle category
Same model across different years	Helps spot safety improvements
Same vehicle with different trims	Helps compare available safety features
NHTSA and IIHS results together	Gives a more complete safety picture

 

Less Fair Comparison	Why It Can Be Misleading
Small car vs. large pickup	Very different size and weight
Old model year vs. new model year	Testing standards and features may differ
Base trim vs. fully loaded trim	Safety tech may not be the same
Overall score only	Individual crash categories may tell a different story

Why Vehicle Size and Weight Matter

In real-world crashes, size and weight can affect crash outcomes. Larger, heavier vehicles generally provide more protection than smaller, lighter ones, although design, structure, airbags, seat belts, and crash prevention systems still matter a lot.

IIHS notes that its awards identify the best safety choices within size categories, and that larger, heavier vehicles generally offer more protection than smaller, lighter ones. IIHS Crash Testing

That does not mean every large vehicle is automatically safer than every small vehicle. It means you should compare vehicles in context.

A smaller car with excellent ratings can still be a smart choice, especially if it fits your budget, commute, parking needs, and fuel economy goals.

Do Safety Features Affect Crash Ratings?

Safety features can play a major role, especially with modern vehicles. Crash safety is not just about what happens during impact anymore.

Today, shoppers should also look at driver-assistance features that may help avoid or reduce a crash. These can include forward collision warning, automatic emergency braking, blind spot monitoring, lane departure warning, lane keeping assist, rear cross-traffic alert, and pedestrian detection.

NHTSA lists recommended driver assistance technologies separately, including forward collision warning, lane departure warning, crash imminent braking, and dynamic brake support. NHTSA

These features are helpful, but they do not replace attentive driving. They are designed to assist, warn, or intervene in certain situations.

Why Trim Level Matters

Two vehicles with the same model name may not have the same safety equipment. That is why trim level matters.

For example, one trim may include blind spot monitoring, adaptive cruise control, or upgraded headlights. Another trim may not.

This is especially important when shopping used. A safety feature that was optional when the vehicle was new may or may not be installed on the specific vehicle you are considering.

Before you decide, check the window sticker, vehicle history, equipment list, and actual buttons or settings inside the vehicle. A salesperson can also help confirm which safety features are included.

How Should Used Car Buyers Read Safety Ratings?

Used car buyers should pay attention to the model year. A 2018 version and a 2024 version of the same vehicle may not have the same structure, airbags, driver-assistance features, or test results.

Safety ratings can also change when testing standards become tougher. A vehicle that looked great under older testing may face more challenging standards in newer model years.

That does not automatically make an older vehicle unsafe. It simply means you should compare it against vehicles from a similar time period and class.

When shopping used, look for a vehicle with strong ratings, a clean history, working safety equipment, good tires, solid brakes, and no signs of major structural damage.

What Should You Look For Beyond the Rating?

Crash ratings are important, but they are only part of the decision. A safe vehicle also needs to be properly maintained.

Good tires, strong brakes, clear headlights, working seat belts, and properly functioning airbags all matter. Even a highly rated vehicle can be less safe if it has worn tires, brake issues, or unrepaired recalls.

Before buying, ask about open recalls. You can also have the vehicle inspected by a trusted mechanic.

A vehicle’s safety score tells you how it was designed to perform. Its condition tells you how ready it is for the road today.

Simple Checklist for Comparing Crash Safety Ratings

Use this quick checklist when comparing vehicles:

What To Check	Why It Matters
NHTSA overall rating	Gives a simple starting point
NHTSA frontal crash rating	Helps compare similar-size vehicles
NHTSA side crash rating	Shows side-impact protection
NHTSA rollover rating	Important for SUVs, trucks, and taller vehicles
IIHS crashworthiness ratings	Shows detailed crash test performance
IIHS headlight rating	Helps with nighttime visibility
IIHS crash prevention ratings	Shows how safety tech performs
Trim-level safety features	Confirms what the specific vehicle includes
Open recalls	Helps identify repairs that may still be needed
Vehicle condition	Safety depends on maintenance, too

What Is the Best Way to Choose a Safe Vehicle?

The best way to choose a safe vehicle is to compare ratings, size, features, condition, and your real driving needs together.

Start with vehicles in the same class. Then compare NHTSA stars, IIHS grades, available safety technology, and overall condition.

Do not assume the biggest vehicle is always the best choice. Do not assume one 5-star score tells the whole story either.

The right vehicle should fit your budget, your passengers, your daily drive, and your comfort level behind the wheel.

When you shop at RC Hill Mitsubishi, our team can help you compare safety ratings, features, trims, and vehicle history so you can choose with confidence. Start by browsing our current new and used inventory, then get one step closer to your next vehicle with our secure credit application.

Frequently Asked Questions About Crash Safety Ratings

What do 5-star safety ratings mean?

A 5-star safety rating means the vehicle performed very well in that specific NHTSA safety test category. One star is the lowest rating, and five stars is the highest. You should still review the frontal crash, side crash, and rollover ratings separately.

Are IIHS ratings the same as NHTSA ratings?

No, IIHS and NHTSA use different testing systems. NHTSA uses a 5-star system, while IIHS uses ratings such as Good, Acceptable, Marginal, and Poor. Checking both gives you a better overall view of vehicle safety.

Can I compare a sedan’s crash rating to an SUV’s crash rating?

Sometimes, but not always. Side crash and rollover ratings can be compared across classes, but frontal crash ratings should be compared with vehicles in the same weight class. This helps prevent misleading comparisons.

Does a higher safety rating mean a car will prevent every injury?

No safety rating can guarantee injury prevention in every crash. Ratings show how a vehicle performed in controlled tests. Real-world crashes can involve different speeds, angles, road conditions, vehicle sizes, and driver behavior.

Do used cars still have valid safety ratings?

Yes, but you should compare the exact model year whenever possible. Safety ratings, vehicle designs, and available safety features can change from year to year. Also, make sure the specific used vehicle has been well maintained and checked for open recalls.

What safety features should I look for when buying a used car?

Look for features like automatic emergency braking, blind spot monitoring, lane departure warning, lane keeping assist, rearview camera, rear cross-traffic alert, stability control, anti-lock brakes, and strong headlights. Also make sure the tires, brakes, seat belts, and airbags are in good working condition.