Final answer:
In case of an emergency delay within service hour limits, the driver should stop and wait for further instructions, prioritizing safety and compliance with legal regulations.
Step-by-step explanation:
If an emergency delays a run that could normally have been completed within the hours of service limits, the correct action for the driver would depend on the specific regulations governing the situation, which can vary by country and by the transport agency. However, in general, safety is always the top priority. For most situations in accordance with transportation safety regulations, the driver should stop the run and wait for further instructions. They should not extend the hours of service limits on their own, as those are usually legally mandated for safety reasons. Option 1 to Continue the run and complete it as soon as possible may not be safe or legal. Option 3 to Extend the hours of service limits to complete the run is typically not within the driver's authority. Option 4 to Cancel the run and reschedule it for another time may be a decision made by the dispatch or management, rather than the driver.