Final answer:
You do not need to stop for a frozen dessert truck on a dual highway if you are separated by a safety island or median. In other situations, such as flashing red lights, a stop signal arm, or pedestrians crossing, you must stop to maintain safety.
Step-by-step explanation:
You shouldn't stop your vehicle for a frozen dessert truck on a dual highway if you are on the other side of a safety island or median from the frozen dessert truck. It is generally safe and legal to continue driving in this situation because the safety island or median provides a barrier that makes it unnecessary to stop for the frozen dessert truck. On the other hand, if the frozen dessert truck shows flashing red lights, a stop signal arm, or if a person is crossing the roadway to or from the frozen dessert truck, you are required to stop to ensure the safety of pedestrians and adhere to traffic laws.