Final answer:
The required speed reduction when passing a stopped emergency vehicle on highways with speed limits under 80 km/h varies by jurisdiction, so local traffic laws should be consulted for the correct speed: 40 km/h, 50 km/h, 60 km/h, or 70 km/h.
Step-by-step explanation:
When approaching a stopped emergency vehicle with flashing lights on highways with speed limits of under 80 km/h, you are required by law to take certain safety precautions. The exact requirements, such as the speed reduction, can vary by jurisdiction. Some regions specify that in addition to changing lanes, drivers must slow down to a certain speed when passing stopped emergency vehicles to ensure the safety of emergency responders. Since specific regional laws were not provided with the question, the following options could be standard: a) 40 km/h, b) 50 km/h, c) 60 km/h, or d) 70 km/h. Therefore, it is essential to check local traffic regulations for the correct requirement in your area.