1. A programmable Blind Spot Detection System for host vehicles having an ECU with a memory and further equipped with an external vision system, comprising: a lane departure warning system having at least one vision sensor for continuously sensing lane offset data for said host vehicle; said lane offset data continuously transmitted to said ECU to continuously determine lane offset as said host vehicle travels in a lane; a Blind Spot Detection System equipped with at least one radar sensor, each said radar sensor projecting a radar beam overlapping with an adjacent radar beam and transmitting radar data to said ECU; each said radar beam having a continuously programmable Maximum Range Limit as continuously determined by the ECU in response to said continuously determined lane offset to warn an operator when an object is detected within said continuously programmable Maximum Range Limit.