Final answer:
Entering an expressway from a left-side ramp involves merging into a higher speed traffic lane, creating a greater potential for conflict due to the need for quick acceleration and the presence of faster-moving vehicles.
Step-by-step explanation:
When an entrance ramp enters the expressway from the left, drivers should be aware of a greater potential for conflict because they will be entering a higher speed traffic lane. Typically, the left lanes on expressways are reserved for faster-moving traffic. This means vehicles entering from a left-side ramp must accelerate quickly to match the flow of the expressway traffic and safely merge, which can be challenging and requires extra caution.