When a bus, truck, or truck-trailer combination is parked during the daytime, what must be displayed?

In situations where a bus, truck, or truck-trailer combination is parked during the daytime, it is important to display red flags as a warning to other drivers and pedestrians. The use of red flags serves as a visual alert that a vehicle is present and may be obstructing traffic, which is particularly critical in maintaining safety on the road.

Red flags are effective because they are easily recognizable and convey a sense of caution to approaching vehicles. By using them, drivers can enhance visibility and reduce the likelihood of accidents or misunderstandings about the parked vehicle's presence.

While other options like safety cones and warning lights also enhance visibility and improve safety, red flags are specifically mentioned in safety regulations for daytime parking situations because they are easy to deploy and can be seen from a distance, making them an effective choice to alert oncoming traffic. It conveys the necessary information without the complications that might arise from using other equipment that may not be readily available or suitable for a stationary vehicle during daylight hours.