Defendant, and his brother, who was a passenger in his car, both testified that they did not see plaintiff's car approaching the intersection, and indicated that their vision was obstructed by cars coming into the intersection on 36th Street's inside lane, parallel to, and in between, plaintiff's lane and defendant's lane. If the particular factual situation forming the background of the collision was not covered by the above quoted Ordinance, or any Statute, it was for the court, acting in lieu of a jury, to determine whether or not either driver was negligent, and, if so, whether such negligence was the proximate cause of the collision. In this connection, see Buck v. Cole, Okla., 467 P.2d 164, 168, citing Southwestern Bell Telephone Co. v. Martin, Okla., 370 P.2d 840, and Garner v. Myers, Okla., 318 P.2d 410. Under all the facts and circumstances that appear from the evidence, and, in view of the above mentioned manual demonstrations, placing the trial judge in a better position, than are we, to determine the facts as a whole, we cannot say a prima facie case was not made out in plaintiff's favor; and, since (insofar as the record shows) defendant interposed no challenge to the evidence as a whole, after both of the parties had rested and the case was submitted to the court for judgment, there is no predicate upon which we may weigh the evidence.