What is the test for determining whether a motor vehicle accident was reasonably foreseeable?

'We are not now called upon to decide whether, in the absence or reduced weight of some of the above factors, we would conclude that the accident and injury were not reasonably foreseeable and that therefore defendant owed no duty of due care to plaintiff. In future cases the courts will draw lines of demarcation upon facts more subtle than the compelling ones alleged in the complaint before us.'

(Dillon v. Legg, 68 Cal.2d 728, 740--741, 69 Cal.Rptr. 72, 80, 441 P.2d 912, 920.)