When are you required to yield the right-of-way?

Yielding the right-of-way is an important traffic rule designed to ensure safety and smooth traffic flow. Merging onto a highway requires drivers to yield to the vehicles already on the highway. This is because highway traffic typically moves at higher speeds, and it's crucial to integrate safely into that flow. By yielding while merging, drivers minimize the risk of collisions and ensure their own safety as well as that of other drivers.

In contrast, the other scenarios listed may not necessarily indicate an obligation to yield. For example, urban driving doesn't always require yielding; rather, the situation dictates when to yield. Additionally, yielding only to pedestrians implies a limited perspective, as there are many other circumstances involving vehicles and different roads where yielding is necessary. Traffic signs also guide behavior but are not the only factors in yielding scenarios. Thus, yielding when merging onto a highway is a clear-cut requirement to maintain safety and efficiency on the road.