More than 2,400 children are accidentally backed-up over each year in the U.S.

And of those, more than 100 die. With the proliferation of SUVs and mini-vans, drivers aren't aware of the enormous rear view blind spots that prevent them from seeing what's behind them, especially small objects, animals, people, and children. Some of these blind spots are even greater than the length of an average driveway! Senators Hillary Clinton (D-New York) and John Sununu (R-New Hampshire) have recently proposed legislation requiring the U.S. Department of Transportation to issue regulations aimed at reducing accidents that frequently kill or injure children in cars. But until that legislation is passed, it's up to the driver to protect their loved-ones and prevent a tragedy by using a Park Assist system or a backup camera.

In fact, the Centers for Disease Control and Prevention estimated 2,767 people were treated in emergency rooms from July 2000 through June 2001 because of backovers. "This is a huge problem," Fennell said. "A lot of [the problem] is due to the change in our vehicle mix" that has more people driving tall-profile vehicles, she said.

Indeed, Fennell's research indicates that "in 60 percent of the [backover] cases, it's a truck, van or SUV that's involved," Fennell said. The reduced rearward visibility is caused by the design and tall profile of SUVs, pickup trucks and even vans.

The top edge of the tailgates and liftgates in these vehicles typically sits high and so do the vehicles themselves. This means that unaware children and small-stature adults and anything not tall enough to be visible in the rear window glass might be run over as the vehicle is backing up.

Consumers can choose from a wider range of aftermarket vehicle-backup systems since our last report, including new and improved designs.

All such systems are intended to help drivers detect objects within the blind spot behind the vehicle.

New are camera systems such as the Audiovox and ParkFX we tested that offer a “picture in the mirror” feature. The display is on a mirror that fits on top of or replaces the existing rear-view mirror, so you don’t have to choose between looking at the display and at the rear-view mirror while backing up. ParkFX also combines a camera with an audible sensor, so you can see and hear potential trouble. We would like to see more backup warning systems on the market that combine camera and sensor technologies.

Backup systems are typically marketed as parking aids, not safety equipment. But our tests show that the camera models can also help drivers avoid backover-accident injuries and fatalities.

How To Avoid Car Gadgets & Choose the Right Park Assist Technology for Your Driving Safety

Know how the device mounts on your vehicle.

Camera and sensor systems that are mounted on the vehicle’s bumper or bodywork may necessitate drilling. They may not be the best choice if you lease your vehicle. If you have a hitch, you can consider a model that mounts in the trailer-hitch receiver. But you would have to remove the system to use your hitch. Other camera and sensor models mount on the license-plate frame. But some states prohibit frames because they can obscure the plate.

Within types, features vary. This is especially true with the sensor models we tested. The ultrasonic systems were generally the most sensitive, but their performance was adversely affected by rain, snow, or other inclement weather.

The microwave-based sensor systems we tested were not affected by weather but are less sensitive as a group. They also don’t warn the driver unless the vehicle or object behind it is moving.

The display quality of the camera-based models is very good, although it doesn’t match that of the larger screens on some carmakers’ systems. Most of the system displays turn on when the vehicle shifts into reverse, but one, the Audiovox, must be turned off and on manually.

LaneFX is More Than Just a Car Gadget

Many of the latest car models include systems that alert you when a car is in your blind spot. Those of us with older autos have had rely on our own road skills -- until now. Drivaware has introduced LaneFX: When you activate your turn signal, the device moves the corresponding side-view mirror to expose your blind spot and any vehicles that may be hiding in it. Of course, if you remember your driver's training, a quick glance over your shoulder does essentially the same thing. The LaneFX is compatible with any car that has power mirrors and is available in a Basic Edition ($197), Highway Edition ($242) and Commuter Edition ($296).

ParkFX For Your SUV - Prevent a Tragedy

At least once a week a child in America is run over, typically in backup (reversing) accidents

You should be. According to Consumer Reports, the blind spot behind a tall vehicle such as a Chevrolet Avalanche truck can extend as much as 51 feet in the case of a small-stature driver about 5 feet 1 inches tall. Even for an average-sized driver, 5 feet 8 inches tall, the blind spot can extend nearly 30 feet behind the Avalanche, according to the consumer advice publication.

"No one is telling people there's a bigger blind spot in these vehicles," said Janette Fennell, founder and president of the child safety advocacy group Kids and Cars.

Pointing out her statistics showing at least one child a week in the United States is killed in a "backover" incident, Fennell urges that some kind of "backover warning and prevention device" be made mandatory on all vehicles.

Automakers are Designing New Car Gadgets Focused on Driver Safety and Awareness

Safer Lane Changes is Just One of the Latest Trends to Include Advanced Gadgets in New SUV Models

Every new car season brings with it a dazzling assortment of high-tech gadgets and an equally formidable barrage of hype aimed at romancing you into this year's model.

What's hot and what's hype? We posed that question to Paul Duchene, a national automotive writer based in Portland, Ore.

"There are a lot of gizmos this year and some of them are good, too," he says. "One of the reasons is there are a lot of new models and a whole bunch of updates this year, including the Nissan 350Z, Mazda's RX-8 and BMW's Z4 and 745i, the car some critics have informally dubbed 'the quarter to eight.'"

Let's put the pedal to the metal and cruise some of this year's hottest new gadgets:

Intelligent cruise control: This lends new dimension to the term "keeping up with the Joneses." Previously, cruise control was a simple proposition: You set your speed and your car maintained it until you tapped the brake or manually turned it off. Infiniti's new wrinkle uses a laser beam to measure the distance between you and the vehicle ahead and maintains a preset distance until you disengage it. The upside is you can't tailgate. The downside depends on the driving skills of the guy in front of you.

Directional stability: This is a little like having your mother-in-law in the back seat, only quieter. "You go into a corner too hard and the car basically figures out that it's about to change direction from where you want it to go and will selectively apply, say, a rear brake on one side just to keep it going in the line that it senses it's pointed," says Duchene. And he tested it. Hard. "It really works, way past the point that it makes sense."

Mouse control: It had to happen and finally does with BMW's 7 series. That dial-shaped gizmo where a stick shift would normally reside is called iDrive and it controls the heat, air, audio level and other cabin-related functions. This gives you a sleek, button-free dashboard. Beginners, however, need to look at the in-dash display to use it.

Voice-recognition system: Sure, we all talk, even scream, at our cars on occasion. Now Infiniti presents one that finally listens. The Q45 voice recognition system allows you to change CDs, adjust the temperature, access your GPS navigation system or make a hands-free cell phone call, all through voice command. The system understands 50,000 words in 150 dialects and even learns the sound of your voice. Hal, is that you?

Run-flat tires: No matter how high-tech your ride, there are four things all cars have in common, and they still go flat from time to time. Run-flat tires don't prevent flats, but they will get you to a repair shop. "When you run over a nail and the tire goes flat, if you keep it under 30 miles per hour, it will get you someplace where you can change it," Duchene explains. "Part of the reason they can do it is that performance tires are much lower profile and deform much less, so you can make stiffer sidewalls."

Mobile entertainment: New minivans approximate all the comforts of home: Pop-down DVD screens, earphone ports, even a remote control to fight over. That takes care of the kids; now what about Mom and Dad? How about coast-to-coast, commercial-free satellite radio? For the cost of a radio receiver ($300 and up) and service (less than $15 a month), you can receive 70 channels of commercial-free music and 40 channels of news, talk, sports and entertainment programming from such providers as XM and Sirius. It sure beats choruses of, "Are we there yet?"

Limp-home mode: How smart is the Cadillac Northstar engine? If you blow a radiator hose, the Northstar automatically reverts to limp-home mode, shutting the gas supply off in several cylinders and turning the engine into a quasi-air cool system. You won't set any land speed records, but your engine will survive the damage you unwittingly might have done to it.

DVD navigation: Because of the limited data storage capacity of earlier onboard GPS satellite-navigation systems, you had to reinstall a different CD of map displays if you wanted to travel to other parts of the country. With the new DVD-based systems, all of North America is now your oyster. Does it play movies, too? Duchene chuckles: "The Lexus system has the ability to play movie DVDs on its screen, but it won't play if you're in gear, so you can't be watching a movie while you're driving down the road." We really didn't think so, but had to ask.

Automatic braking: Remember your mother-in-law in the back seat? Here's a feature that cleverly simulates the effect of her panicked stranglehold on you in a traffic crisis. "There are brake systems now that have a brains-override thing where they figure you're not braking hard enough for what's going on and will actually add power to the brakes," Duchene says. Easier on the esophagus, too.

Head restraint, side curtains and pre-tensioners: Luxury cars feature all the safety money can buy. In addition to standard forward and side airbags, many models now come with inflatable head-restraint bands along the top of the windshield and inflatable side window curtains. The Lexus system automatically cinches up your seat belt with pre-tensioners just milliseconds before impact. Cadillac's Escalade SUV uses sensors to analyze the size and weight of front-seat passengers and automatically deactivates the front air bag if it detects a child or rear-facing child seat riding shotgun. "Though not yet on the market, the car companies are developing a 'catcher's mitt' seat that, if things go wrong, just kind of grabs you and holds you in place," says Duchene.

Back-up assistance: If parallel parking is not your strong suit, you'll be pleased to hear about a couple systems designed to give you a better look at your rear end. GM's Ultrasonic Rear Parking Assistant uses four sensors to triangulate the position of objects behind you and guides you with both an audible chime and LED lights at the back window. Infiniti's RearView Monitor goes one step further and actually displays on the dashboard monitor a full-color video from a rear-mounted mini-cam. Now all you've got to do is find a parking space.

Automatic accident reporting: In the event of an accident, your car can now phone for help, even if you can't. "Some of this stuff now, if you have a crash, the car calls home and 911 and says, 'I've been hurt,'" Duchene says. "But that has its drawbacks. As one of my friends pointed out, sometimes when you make a mistake, you could use about 20 minutes to get away."

Back-over Accidents

Moms Put ParkFX to the Test

Compare Backup Sensors & Cameras to ParkFX

Get the Latest Information on the Most Reliable Backup Warning Technologies

Not all reversing aids are equal. The sensing technology and the indicating method are critical to your driving safety.

How a park assist system alerts you

One option is video, which at first seems like a great choice. But one major flaw with having a video camera affixed to the back of your car with a monitor on your dashboard is that it also forces you to look forward while backing up. That can disturb your perception, your reaction time, and feel very unnatural. They are also extremely expensive, and you'll pay thousands of dollars to have a video system attached to your car, whether from the dealer or an aftermarket supplier.

Compare that to other bargain basement devices which actually have LED displays (little red lights) on your dashboard. These are cumbersome -- almost useless -- for much the same reason as video: when you drive in reverse, you naturally look behind you, and you'll never see the little red lights. They are also hard to read in bright sunlight.

Some other bargain technologies use a tone which beeps more rapidly as you get closer to an obstacle. You can at least hear the relative distance just by listening to the beeps, but you have to practice a bit to really understand how far you are from danger.

That's why an audible voice sensor is best. It tells you in a spoken voice exactly how far away you are. Not only do you not have to awkwardly look forward at your dashboard, you'll know without guessing how much further you can safely back up.

How a reversing aid detects objects

If you've never seen or used a reversing aid, you might be surprised at how technically advanced they actually can be.

Reversing aids use a variety of technologies to sense an object behind the car. Some units use Doppler radar, and others use infrared sensors, but by far the most accurate method of detection is the one the U.S. Navy uses on its submarines: sonar.

Sonar can operate in any weather, including direct sunlight or rain. And it doesn't require that the car be moving in order to sense an obstruction.