3. Rollover ratings in which a metal plate hits the corner of a vehicle to determine how much force it can take before rolling over

4. A rear-impact protection rating that focuses on the ability of seats and seat belts to protect against whiplash.

The worst-scoring cars commonly received poor grades in the last two categories.

24/7 Wall St. also examined other safety measures for these vehicles including Consumer Reports ratings, crash safety ratings performed by the National Highway Transportation and Safety Administration and JD Power's overall Initial Quality report.

However, poor ratings have not affected the sales of these vehicles—in fact, sales are up from last year.

Before you go shopping for your new car, see which vehicles are the most dangerous cars in America.

7. Suzuki SX4

Bad ratings: rollover-marginal, rear-marginal

2011 sales: 12,520

Price: $13,849

Out of over 30 small cars tested by the IIHS, the Suzuki SX4 was the only one to receive two scores of “marginal” or “poor” out of four ratings. Additionally, the SX4 received a “fair” rating—the second-lowest possible—in government side-crash testing.

6. Jeep Wrangler

Bad ratings: side-marginal (two-door), side-poor (four-door), rear-marginal

2011 sales: 122,460

Price: $22,970 (two-door), $30,745 (four-door)

One of the few cars that underperforms the two-door Jeep Wrangler is its larger companion, the four-door Wrangler. During an IIHS side-impact test, a dummy was struck by the steel bars supporting the four-door Wrangler's convertible roof. Both models were unable to protect the driver's or back seat passengers' heads and other body parts in simulated accidents.

5. Nissan Pathfinder

Bad ratings: rollover-marginal, rear-marginal

2011 sales: 25,935

Price: $29,290

In addition to troubling scores from the IIHS, in government rollover tests, the Nissan Pathfinder registered an estimated 20 percent to 30 percent risk of rolling over.

4. Mazda CX-9

Bad ratings: rollover-marginal, rear-marginal

2011 sales: 34,421

Price: $29,725

The Mazda CX-9 had the lowest strength-to-weight ratio of all midsize SUVs tested by the IIHS. Why is that bad? The strength-to-weight ratio measures how much force a car's roof can handle before it crushes five inches, and then it is divided by the weight of the car.

3. Mazda CX-7

Bad ratings: rollover-marginal, rear-marginal

2011 sales: 35,641

Price: $22,190

Mazda makes it on the list again with its CX-7. The car received “good” scores in front and side impact ratings, but low grades in rollover and rear-impact drive its safety rating down. The CX-7 will be replaced by the newer CX-5 model next year, hopefully with better safety measures installed.

2. Chevrolet Colorado Crew Cab

Bad ratings: side-poor, rollover-marginal, rear-marginal

2011 sales: 31,026

Price: $17,475

This small pickup truck from Chevrolet received poor ratings in the IIHS, including a “poor” side-impact grade and “marginal” grades for rollover and rear safety. In November 2011, 5,220 Colorados were recalled due to seat belt safety concerns, adding to its dangerous safety ranking.

1. Dodge Ram 1500

Bad ratings: side-marginal, rollover-marginal

2011 sales: 156,983

Price: $22,120

The Dodge Ram 1500's long history of an unimpressive safety record continues with the latest model. The truck received failing marks from the IIHS in the past in frontal offset tests and was rated “poor” in protecting heads and left legs as well as in restraining the crash test dummy. Today, the vehicle's side-impact and rollover ratings remain substandard.