What is the test for establishing cause in a motor vehicle accident?

The plaintiff need not establish that the defendant’s negligence was the sole cause of the injury. If other potential causes exist, such as the bike crash in this case, the plaintiff will still establish cause in fact if she can prove a substantial connection between the injury and the defendant’s conduct, beyond the de minimus range: Farrant v. Laktin, 2011 BCCA 336, at para. 11.