Layer 1:
The Common Sense Approach
The common sense approach is the simplest and most cost-effective way to thwart thieves. Some of these suggestions are obvious; some might not have occurred to you. But they can all help protect your car:

of time, disable it--for example, remove the ignition fuse, coil wire or distributor rotor

Layer 2:
Visible or Audible Deterrent
There are many devices designed to alert thieves that your car is protected. Popular examples include:

• audible alarms
• steering wheel locks
• steering column collars
• theft deterrent decals
• tire locks
• V.I.N. Etching: etch vehicle identification number (VIN) on vehicle windows

Layer 3:
Vehicle Immobilizers
These devices prevent thieves from bypassing your ignition and hot--wiring your vehicle. Some use computer chips in ignition keys, while others inhibit the flow of electricity or fuel until you hit a hidden switch. Here are a few examples:

• smart keys
• use cut-offs
• kill switches
• starter, ignition and fuel disablers

Layer 4:
Tracking Systems
A vehicle tracking system is a high-- tech device designed to be hidden in your automobile in order to emit a signal that the police can monitor if you report a theft. These systems are very effective in helping authorities recover stolen vehicles.

The Layered Approach to Protection
The more time a thief has to spend stealing a car, the greater the chance of detection. That's why car thieves take the easy route-- it's faster. To make your vehicle a tough target, the National Insurance Crime Bureau recommends a "Layered Approach." The more layers of protection on your vehicle, the tougher it is to steal.