You see a yellow curve sign with a 25 mph advisory plaque below it, while the posted speed limit remains 45 mph. What is the best interpretation?

1. The plaque recommends about 25 mph for the curve, even though the general speed limit remains 45 mph
2. The legal speed limit is automatically 25 mph for the next 10 miles
3. The advisory plaque applies only to motorcycles
4. You must drive at least 45 mph through the curve