Utilizing four short-range radar sensors (two at the front, two at the rear), one long-range radar and a stereo camera, the vehicle is capable of cruising down an open freeway as well as negotiating heavy rush-hour traffic.

ENGADGET: Continental gets automated vehicle approved for Nevada roads

Recent advances in radar technology, and a new unmanned air vehicle that can spot camouflage on a truck and track the vehicle from 16 kilometers high, may arrive in time to help retaliate against the Sept. 11 terrorist attacks.

FORBES: We See You

These systems use camera images or near-range radar to determine the direction and position of the vehicle in relation to lane markings.

ECONOMIST: Motoring

Building on Volvo Car Corporation's and Volvo Technology's already existing safety systems - including features such as cameras, radar and laser sensors - the vehicles monitor the lead vehicle and also other vehicles in their immediate vicinity.

ENGADGET: Volvo's driverless road train in Spain is public mainly on the plain (video)

The company deployed the sonar on its torpedo-like Bluefin-21 autonomous underwater vehicle and then used a video-equipped remotely operated vehicle owned by Submersible Systems Inc. to inspect any promising radar targets.

WSJ: Sonar Image Renews Hope of Locating Earhart Plane

Unlike current radar-assisted offerings from companies like Infiniti, Distance Plus can control the vehicle in both highway and city driving conditions, meaning you can commute from Harlem to Wall Street down the West Side Highway while sipping your coffee and reading the Post Engadget on your mobile, glancing up occassionally to steer.

ENGADGET: Mercedes' new S-Class rocks Distance Plus urban cruise control