Apple has revolutionized the technology and communication market with the introduction of its iPhone and they are now looking into incorporating that software into a brand new market: cars.

Apple is working to install Siri, its popular voice-enabled personal assistant software, into automobiles. It would allow drivers to access the company's in-house Maps service with navigation features and traffic updates.

Navigation systems have been on the decline as more drivers switch to using smartphones for directions, particularly the use of Google Maps. Add in Apple's "Eyes Free" feature, which allows users to access Siri by pressing a button on the steering wheel, and Apple looks to have the making of a very successful business venture.

At least eight car manufacturers are considering using Apple's Siri button while three, GM, Honda and Toyota, have confirmed plans to use the software. It will will allow drivers to access their iPhones to call people, play music, hear and dictate text messages, ask for directions, find calendar information and more.

The move benefits Apple in two ways. First, it makes the iPhone even more valuable as it further increases the phone's use. In addition, it could lure customers into using more and more apps.

For car manufacturers, it creates a relationship with a very popular brand and technology, which will only help lure more customers.

The implementation of Siri into cars will hurt Apple's competition and may force them to make changes. Shares of Harman International Industries Inc., manufacturer of audio devices, fell about 10 percent on Tuesday after Apple announced plans to put Siri in cars. The shares of other navigation system makers, Garmin Inc. and TeleNav Inc., also fell.

Meanwhile, wehicle navigation systems maker TomTom NV saw its stock rise 15 percent rise when it completed a deal to license its maps to Apple.

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