What is the minimum distance to signal before changing lanes on a highway?

The correct choice indicates that a driver should signal at least 100 feet before changing lanes on a highway. This practice is essential for ensuring safe lane changes, as it provides adequate notice to other drivers about your intentions. Signaling in advance gives surrounding vehicles the time to react, reducing the risk of accidents caused by sudden lane changes.

In many situations, particularly on higher-speed roads like highways, a longer signaling distance helps maintain a smooth flow of traffic and contributes to overall safety. Although some might think shorter distances could suffice, 100 feet strikes a good balance, ensuring visibility to other drivers while allowing time for them to adjust their speed or position accordingly.