In the fight for a bigger share of the domestic car market, Toyota Motor Corp., Honda Motor Co. and Nissan Motor Co. have shifted to a new battlefield -- "telematics" informational network systems

Prompted by voice commands or input on display panels, telematics systems convey a variety of data, including traffic information, e-mail and access to emergency assistance.

Experts say telematics services are becoming an important feature in the highly competitive automobile market.