An examination may be incomplete with the applicant neither passing nor failing. He may not pass until he has successfully completed each part of the examination separately. He must fail as soon as he demonstrates he is unable to pass. The examination is incomplete, therefore, when it is discontinued for some reason other than the applicant's lack of ability. For example, when a motorcycle runs out of gas, has a puncture or otherwise fails to function during the traffic examination, the examination is discontinued, but the driver is not disqualified.