Is it allowed to unauthorizedly open the barrier or bypass it while on duty?
Prohibited.✓الإجابة الصحيحة
Allowed.
Allowed at driver's discretion if there is no approaching train in the vicinity.
Allowed if there is no crossing guard on duty.
الشرح
A driver may neither raise a closed barrier without authority nor steer around it, even during an official assignment. The apparent absence of a train or crossing attendant does not override the barrier and crossing controls.