adaptive cruise control 
The first interactive cruise-control systems weren't much fun. But new radar and laser technology has allowed more advanced systems to lock onto the vehicle in front of you at operator-selected distances: from driver's-ed-safe to LA-freeway-close. And the braking system is now integrated, leaving the tech-savvy to concentrate on that hands-free phone call. As a bonus, the brake integration will hold the vehicle at a set speed on steep grades.

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