An independent evaluation by Ford Motor Company compared a non-adaptive Lane Departure Warning (LDW) system to an adaptive LDW system developed by Delphi Electronics and Safety for the USDOT-sponsored SAfety VEhicle(s) using adaptive Interface Technology (SAVE-IT) program. The adaptive LDW system alerted the driver only if a Driver State Monitor (DSM) indicated the driver was looking away from the road ahead for 2 seconds or longer aroundthe time when a lane line was crossed. Forty (40) volunteers drove a high-fidelity, moving-base simulator in a study to compare driver response toa surprise lane departure when using a non-adaptive LDW system followed by an adaptive LDW system or vice versa. Results indicated that thirteen subjects (34%) in adaptive LDW mode experienced either delayed activation of the LDW alert or received no LDW alert when they should have. The delayed LDW or no LDW cases were caused primarily from a combination of the 2-second rule in the adaptive LDW algorithm, and DSM registration issues. The delayed LDW resulted in significantly larger lane excursions at onset ofthe LDW compared to the non-adaptive LDW mode. These results highlight the fact that performance effects of adaptive systems are very dependent on system hardware, algorithms, and algorithm parameters.
Samenvatting