Why is signaling before changing lanes important?

Signaling before changing lanes is crucial because it alerts other drivers of your intentions. By using turn signals, you communicate your planned actions to those around you, which enhances safety on the road. This communication allows nearby vehicles to anticipate your movement and adjust accordingly, reducing the risk of accidents. It fosters a more predictable driving environment, where all road users can respond to each other's maneuvers appropriately.

The other options do not capture the primary function of signaling. Signaling does not inherently increase speed, nor does it allow for weaving in and out of traffic—such actions can be dangerous and are typically discouraged. Furthermore, while checking mirrors is an essential part of safe lane changes, signaling does not minimize the need for this practice; both signaling and mirror checks are fundamental to safe lane changes.