When getting ready to merge onto an expressway, it's most important to:

When preparing to merge onto an expressway, increasing your speed to match the flow of traffic is crucial for a safe and smooth merge. Expressways are designed for higher-speed travel, and entering at a significantly lower speed may create dangerous situations, such as being a hazard to other drivers or causing abrupt maneuvers. By accelerating to match the traffic speed, you can safely merge into an available space, allowing for a smoother transition onto the expressway without disrupting the speed of other vehicles.

The other options, such as stopping before merging, would cause significant risks as it could lead to rear-end collisions. Looking for a police officer to assist is unnecessary, as merging onto an expressway is typically a driver’s responsibility. Finally, checking only your rearview mirror and ignoring your blind spots does not provide a complete view of the environment, which is essential for a safe merging maneuver. It is important to check both mirrors and blind spots to ensure there is no vehicle in the adjacent lane that may interfere with the merge.