Final answer:
The correct answer is option 3) The expressway ramp ahead is metered.The correct answer to what the flashing yellow lights indicate about an expressway ramp is that the ramp is metered, which means traffic is regulated onto the expressway to prevent congestion.
Step-by-step explanation:
When you see a road sign with yellow lights above and below, it commonly indicates that the ramp you're approaching uses a traffic signal to regulate the flow of cars onto the expressway.
This is known as ramp metering. The purpose of this system is typically to prevent congestion on the expressway by controlling the rate at which vehicles enter, based on current traffic conditions.
It's not a sign that the ramp is closed, open without restriction, or under construction. Instead, these lights suggest that drivers can expect to stop at the ramp and proceed when the signals allow, merging smoothly with expressway traffic.