A red or orange fluorescent flag must be attached to the extreme end of the load during daytime when it extends over four feet from the rear of a vehicle. This requirement is for safety and visibility to other drivers.
When a load extends more than four feet over the rear of a vehicle, a red or orange fluorescent flag must be attached to the extreme end of the load during daytime hours. This is a safety requirement to alert other drivers of the vehicle's extended dimensions, reducing the risk of accidents. While this requirement may differ in specific wording across jurisdictions, the use of a brightly colored flag is generally a standard traffic law.
It is analogous to the rule that you must stop your vehicle at a red traffic light, with exceptions under certain circumstances such as an emergency, for example when there is a pregnant woman in the vehicle who is about to deliver. In the described situation, an Rational Utilitarian (RU) might suggest that proceeding through the red light (after ensuring the road is clear) to reach the hospital more quickly would serve the greater good, which could be considered a moral action within that urgent context.