What are you required to do according to the following road sign?

1. Give right-of-way in a narrow road.
2. Continue driving normally. You have right-of-way over opposing traffic.
3. Give a left signal and carefully cross to the left lane while glancing in the mirrors.
4. Correct answer: Slow down, keep to the right, and stay alert for oncoming traffic.

WhyAt a road narrows sign, slow down, keep to the right and watch carefully for oncoming traffic.