What should you do if a speed limit is not posted before a curve on the highway?

If a speed limit is not posted before a curve on the highway, you should reduce your speed based on the road conditions, visibility, and the sharpness of the curve. Use your judgment to maintain a safe speed that allows for control of your vehicle. Additionally, be aware of other vehicles and adjust accordingly to ensure safety for yourself and others. Always prioritize caution in areas where speed limits are unclear.