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

1. Correct answer: Prepare to slow down, if necessary. Pay attention to traffic congestion and adjust your driving to the traffic and to the road’s conditions.
2. Continue driving and be alert about the conduct of other vehicles from your right.
3. Obey the instructions of road workers and proceed according to the markings.
4. Drive faster and overtake slow vehicles.

WhySince there is heavy traffic ahead, be ready to slow down and match your speed to the traffic and the road. This is exactly where you should not overtake or speed up.