What is the proper action for a truck driver when an emergency vehicle with flashing red and blue lights and a siren approaches from behind on a two-lane undivided road in Belarus?

1. Maintain highway speed and flash hazard lights
2. Pull over to the right road edge (or shoulder) and come to a complete stop, waiting until the operational convoy has passed
3. Speed up to find a parking lot 5 km away
4. Stop in the left lane