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	Ignition The driver starts the car per her usual routine. Upon ignition the air conditioner starts and the engine revs and idles, creating an ambient noise level in the car. All dashboard lights come on for a moment as visual feedback for the ignition. [note: the brief voice-over at the beginning of this scene is an introductory jingle -- not part of the interface]
	Sonopticon Activated The Sonopticon system automatically begins. A semi-transparent window laid out against the heads-up display (and an aural cue) briefly announces the activation of the system. Since the Sonopticon system acts as the car's "smart mixer" the radio is turned on (likely to the station last tuned in) and the volume is adjusted.
	Rearview Mirror Check The driver begins to back the vehicle out of the parking space. She briefly checks her rearview mirror, sees another vehicle behind her, but continues on. The Sonopticon does not yet engage because the distance between the two cars does not yet suggest an imminent collision.
	Collision Avoidance Alert The HUD overlays a red target in the rearview mirror and sounds a warning. Obviously, if the driver continues in reverse she is not looking at the mirror, thus obviating the usefulness of placing visual information there. However, in the interest of minimizing visual clutter and, more importantly, to contextualize the warning (so that she knows that the target icon refers to the rear of the car rather than out the front windshield) the icon is placed over the mirror. Also, the aural cue is non-directional and can thus be attended to without the driver looking to the rear. [NEXT SCENARIO]

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