Which of the following should you never do at a stop sign?

Stopping only at the stop line is actually a necessary action at a stop sign and is crucial for maintaining safety and adherence to traffic laws. When you reach a stop sign, it is required by law to come to a complete stop at the designated stop line. This ensures that you have the appropriate visibility for oncoming traffic and pedestrians, allowing you to make safe decisions about when to proceed.

In contrast, the other choices highlight improper behaviors. For instance, ignoring other drivers can lead to dangerous situations, as you may not see other vehicles or pedestrians that have the right of way. Speeding through a stop sign compromises safety and violates traffic laws, potentially resulting in collisions. Stopping only if there are other cars also demonstrates a misunderstanding of the rules; every driver must stop at a stop sign regardless of the presence of other vehicles, ensuring that intersections are navigated safely.