When merging onto the expressway, what should drivers do?

Merging onto the expressway requires drivers to match the speed of vehicles already traveling in their desired lane. This is crucial for safety because when a driver enters the expressway, they are often aiming to merge into faster-moving traffic. By accelerating to a similar speed, drivers can weave into the lane more smoothly, reducing the risk of accidents caused by abrupt speed changes.

Maintaining a speed similar to that of the traffic helps to facilitate a safe and efficient merge, allowing vehicles to enter without forcing others to brake or make evasive maneuvers. This approach also helps maintain overall traffic flow, which is particularly important on busy expressways.

The other options suggest actions that can hinder merging efficiency. For instance, slowing down to yield can increase the risk of collisions, as it may not provide enough time for other drivers to respond properly. Stopping before entering the expressway is generally not advisable since it creates a situation where the merging driver is at a complete standstill, making it difficult to merge into fast-moving traffic. Driving only at the posted speed limit might not be sufficient if that speed does not match the flow of traffic; therefore, a focus on aligning with other vehicles' speeds is paramount when merging.