Archive for March, 2009

 
Wednesday, March 25th, 2009
Texture - tire tread
Image by Lee Coursey via Flickr

When The Treads On Your Car’s Tires Wear Down

Tires wear down over time. As they do, your ability to control your car erodes. Under normal circumstances (for example, driving at regular traffic speeds during dry weather conditions), that may not be a safety issue. However, inclement weather can cause slippery roads. One mistake behind the wheel can potentially send your vehicle skidding across the road without the ability to grip or provide traction.

It’s important to realize that the rubber on your treads is constantly wearing down. Driving creates friction between the rubber and the road; after prolonged use, they become worn. When they reach the halfway point, they become a safety issue. They endanger not only yourself, but other motorists. Below, we’ll explore the danger that worn treads can represent and the effects of their wearing down. I’ll also provide a few tips that you can use to check your car’s tires.

Understanding The Potential Danger

As noted, normal weather isn’t nearly as dangerous as wet weather. But, when the roads become wet, the moisture on them can cause hydroplaning. New wheels have rubber in which deep grooves are set. The moisture on the road goes into the grooves, allowing your tires to touch and grip the road.

Now, imagine that you’re driving on treads where the grooves are half worn away. Because the grooves are worn – and thus, shallower – the moisture does not seep into them as deeply. That limits the ability of your tires to gain traction on the road. In sudden stop situations, hydroplaning is practically unavoidable. That can cause your vehicle to careen into other drivers, or worse, pedestrians.

The Effects Of Wearing

When your wheels wear down, they can cause a number of problems, especially in rainy or snowy weather. For example, when you’re driving in the snow, the grooves in your wheels allow them to bite into the surface, increasing their grip. Worn treads reduce this grip. Also, your car has an increased tendency to hydroplane at lower speeds. The shallower the grooves are, the less capable they are of channeling the water; therefore, the less grip your tires can maintain on the road.

Tips For Improving Your Safety

Millions of drivers routinely check their car’s oil and even the air pressure, but fail to inspect the level of wearing in their treads. It’s easy to do; a reliable way to measure requires a penny. Insert the penny inside the grooves with Lincoln’s head facing down. If any of the grooves are not deep enough to partially hide Lincoln’s head, the treads have worn down too far. Even if the topmost portion of his head is submerged in the crevice, the rubber will have already lost some of its road-gripping ability.

Spending money to replace one or more of your tires may not be pleasant, but doing so can protect you, your passengers, and other drivers from a collision.

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The Basics Of A Car’s Electronic Stability Control

Driver safety is critical, but unfortunately, some aspects will be outside your control when you’re on the road. For example, poor weather conditions combined with slippery roads can easily lead to a traffic collision. Fortunately, automakers are designing vehicles with more flexible safety features. Electronic stability control (or ESC) was developed nearly 20 years ago and made its automotive debut in 1992. Following years of research, electronic stability control was created to help drivers compensate during a loss of steering control by braking accordingly.

Overview Of ESC Technology

During a slip or skid, a wide array of sensors throughout your car send data to the onboard computer. By analyzing this information (i.e. yaw, wheel position, steering wheel position, speed, etc.), the brakes are applied individually in order to compensate. For example, during oversteer the brakes on the outer front wheel may be applied. What makes ESC indispensable is the fact that a human driver is unable to apply the brakes individually, thus affording the computer a greater range of control.

In certain cars, a high-performance ESC system may be installed. With this system, the computer is programmed for a greater traction allowance so the car is able to skid more before the brakes engage.

When the system is activated, drivers are typically alerted with a warning light, while certain cars have an alarm that sounds. Part of the motive behind warning signals is the overinflated sense of confidence many drivers feel with stability control, thus the need to remind them of the vehicle’s handling limits. In addition to a warning signal, each system will demonstrate different tendencies when activated. For example, the driver may feel the automatic pumping of the anti-lock brakes, or the car may shift direction slightly.

How Effective Is It?

ESC is responsible for a significant decrease in the number and severity of traffic collisions. By some reports, the technology is directly associated with an estimated 32% drop in risk for fatal multiple-vehicle crashes, and a 32% drop for fatal single-vehicle collisions. Overall, electronic vehicle stability control reduces the chances for a fatal collision by 43%. Including non-fatal crashes, the overall likelihood is reduced by 35%.

It’s important to note that the technology is not perfect. It is still possible to lose control of your vehicle when you’re driving on slick roads, over the speed limit, or with poorly inflated or worn out tires.

ESC versus TSC

Traction stability control (or TSC) is a predecessor of ESC. First implemented in 1987, TSC is only able to sense wheel slippage, and once detected, apply the brakes or decrease engine output – or both. While TSC can recover from certain slips, it is unable to compensate for all road conditions. In modern control systems, TSC has been incorporated into ESC.

Ideally, you’ll never need to rely upon your vehicle’s stability control system. However, like most of your car’s safety features (for example, air bags), the technology is an invaluable tool that can literally save your life.

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