If the vehicle taximeter suddenly malfunctions or its display screen dies halfway through a trip, how should the fare be settled under municipal taxi regulations?

1. The driver may charge triple the usual fare based on the driver's memory
2. The driver should explain the equipment malfunction, negotiate a reasonable discounted base fare based on distance traveled, or waive the fare in accordance with local regulations, and cannot charge full inflated rates
3. The passenger is obligated to purchase a new taximeter for the taxi
4. The driver must immediately terminate the trip and leave the passenger on an elevated bridge