What should you do after you have moved into the deceleration lane?

After moving into the deceleration lane, the correct action is to slow down. This lane is specifically designed to help drivers reduce their speed in preparation for a turn or an exit from the main roadway. Slowing down allows for a smoother transition from the high-speed travel of the main road to the lower speeds typically required on exit ramps or at intersections.

Maintaining an appropriate speed in the deceleration lane is important for safety, as it allows other vehicles to react appropriately to your change in speed. It's essential to clearly signal your intentions to other drivers and ensure you can stop or make the turn safely once you're at a suitable speed.

The other options are not advisable because speeding up could lead to dangerous conditions if you are trying to merge or slow down safely; checking the rearview mirror is important, but it needs to be part of a broader set of checks that also include side mirrors, rather than the only action taken; and turning on hazard lights is generally reserved for specific situations, such as when your vehicle is disabled or when you are driving significantly below the speed limit, rather than for merely decelerating.