" See also, Hawkins v. Eason, 164 Va. 350, 356, 180 S.E. 177; Hair v. City of Lynchburg, 165 Va. 78, 83, 181 S.E. 285. We are not unmindful of the rule that what is the proximate cause of an accident of this character is generally a question for the jury and not for the court to determine.