A full view coverage is one problem, and another is a reliable detection of the type of object that triggers a collision warning.
Fujitsu's sensor development company, Fujitsu Ten, said that it is working on a 3D Electronic Scan Millimeter Wave Radar that uses 77 GHz millimeter-wave radars to enable the detection and identification of objects in their three dimensions. This new scanner promises to detect objects "above and below" more reliably. For example, it could identify traffic signs or falling objects, which could provide more information to add to crash protection system.
Traffic sign detection is not new and can be purchased especially in most European cars (in Europe) today. However, the promise is that such a system will be able to actually identify the nature of an object, such as persons, other cars or any stationary object.