Final answer:
You are required to slow down to 60 km/h when approaching a stopped emergency vehicle with flashing lights on highways with speed limits of 80 km/h or over, in addition to changing lanes.
Step-by-step explanation:
When approaching a stopped emergency vehicle with flashing lights on highways with speed limits of 80 km/h or over, in addition to changing lanes, you must slow to 60 km/h. This safety measure is crucial to ensure the protection of emergency personnel attending to incidents on the road. It is part of what is commonly referred to as the 'Move Over' law which requires drivers to slow down and move over to give space to stopped emergency vehicles. These rules can vary by jurisdiction, so it's always important to be aware of local traffic laws.