In Iowa, what must drivers do when merging onto a highway?

When merging onto a highway in Iowa, drivers must yield to the traffic that is already on the highway. This rule is vital for maintaining safety and ensuring a smooth flow of traffic. The merging vehicle does not have the right of way, so it is essential that the driver assesses the speed and distance of oncoming vehicles. Yielding allows the driver to enter the highway safely, reducing the risk of collisions.

In this situation, the other choices do not align with safe merging practices. For instance, quickly accelerating to match traffic speed is important, but it should be done while yielding to oncoming traffic rather than ignoring their right of way. Signaling without checking mirrors is unsafe, as it fails to ensure that the driver is aware of the surrounding vehicles before changing lanes. Lastly, stopping at the end of the ramp can be dangerous and might disrupt the flow of traffic, as it can lead to unintended collisions when other vehicles are approaching at speed. Thus, yielding is the key requirement when merging into highway traffic in Iowa.