What does a vehicle with a green flashing beacon indicate?

Answer: B — Dr on call

A vehicle with a green flashing beacon indicates that the driver is a doctor on call. This allows them to quickly and safely respond to emergency situations when they are needed. Option A is incorrect because electric vehicle charging is typically denoted by a blue flashing beacon. Option C is incorrect because security patrols often use amber or red flashing beacons to indicate their presence. Option D is incorrect because vehicles providing environmental services often use amber or red flashing beacons, depending on their specific job duties.