Compare Backup Sensors & Cameras to ParkFX for the Most Reliable Backup Warning Technology

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.

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ParkFX is the 360-Degree Backup Solution That's Less Costly Than Backup Sensors, Park Assist and Rearview Cameras

Deaths increase. Ninety-one children were killed in 2003 by drivers who didn’t see them while backing up, according to Kids and Cars ( www.kidsandcars.org ), a nonprofit organization working to improve child safety around vehicles. Those deaths represented a 57 percent increase from 2002. During the first six months of 2004, more than 40 deaths have been attributed to backover accidents, many involving vehicles with large blind spots.

Kids and Cars compiles these statistics; the federal government does not track such incidents. Janette Fennell, president of the organization, believes that backover accidents are underreported and that the actual number of children killed or injured is much higher.

Blind spots grow with vehicle size. A likely reason for the increase in injuries is that minivans, pickups, and SUVs account for more than half of all vehicles sold. Many have large rear-view blind spots.

Last year, Consumer Reports began measuring the blind spot of each vehicle we test, checking the distance for short drivers (5 feet 1 inch tall) and for those of average height (5 feet 8 inches tall). The biggest blind spot: 51 feet for a short driver in a Chevrolet Avalanche pickup. But even small sedans can have blind spots of more than 40 feet. We regularly update vehicle blind-spot information, which is available on this site free of charge in The problem of blind spots.

Systems other than ParkFX combine a camera with sensors, so we tested each system independently; it is listed with camera systems in the Ratings.

All the systems we tested are potentially useful. They’re a good complement to looking around the vehicle before entering, and checking the rear window and rear-view mirror just before and while moving in reverse.

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Drivaware has come up with something useful: the LaneFX , a controller that connects your power mirrors to your turn signals, so that when you signal (you do signal before you turn, right?), your mirrors swivel outward to show your blind spot. Hey, if this keeps just one cyclist out of the hospital, I'm happy.

Generally speaking, larger vehicles have larger rear blind spots. For example, the blind spot behind a typical sedan could only hide a small animal, while the blind spot of an SUV can hide small children, resulting in as many as 50 children being killed by reversing SUVs each year. The blind spot behind tractor trailers can contain entire vehicles, which is one reason many trucks carry warnings not to follow too close, such as "if you can't see my mirrors, I can't see you." This is partly because the driver's position is higher in a tractor-trailer.

Larger vehicles also have much larger front and side blind spots. Tractor-trailers have not only large rear quarter blind spots, but also a large blind spot directly to their left and to their front-right.

There are a number of products available to consumers to deal with the blind spot problem. Convex mirrors, often called "spot mirrors" can bring blind spots into view, but their optical properties impart a great deal of distortion so as to make it difficult to judge distances. Newer technologies using aspheric mirrors allows the blind spots to be virtually eliminated while minimizing distortion.

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.