Lane assistance system responsive to extremely fast approaching vehicles

A lane assistance system for providing a fast rearwardly approaching vehicle output or an extremely fast rearwardly approaching vehicle output in response to a rearwardly approaching vehicle nearing a host vehicle, the system comprising:

• at least one rear sensor unit disposed proximate to a rear of the host vehicle, the at least one rear sensor unit configured to detect at least one of a distance and a velocity of a rearwardly approaching vehicle moving toward the host vehicle;
• and
• an electronic controller configured to:
• obtain host vehicle velocity information,
• obtain at least one of a distance and a velocity of a rearwardly approaching vehicle,
• determine a relative velocity of a rearwardly approaching vehicle in relation to the host vehicle;
• when a lane of a rearwardly approaching vehicle is obtained via the at least one rear sensor unit,
• upon determining that (a) a rearwardly approaching vehicle is within at least one neighboring lane on either side of a host vehicle lane that the host vehicle is traveling in, and (b) the relative velocity indicates a rearwardly approaching vehicle is approaching the host vehicle at or greater than a fast relative velocity threshold, providing the fast rearwardly approaching vehicle output,
• when a lane of a rearwardly approaching vehicle is not determinable due to a lack of angular resolution for the rear sensor unit,
• upon determining that a rearwardly approaching vehicle has a relative velocity that is at or greater than an extremely fast relative velocity threshold, providing the extremely fast rearwardly approaching vehicle output.