What must vehicles do when emerging from a driveway or alley?

When vehicles are emerging from a driveway or alley, they must come to a complete stop before crossing the sidewalk. This is important because it ensures that drivers have a clear view of the road and any pedestrians who may be using the sidewalk. Stopping allows the driver to check for any oncoming traffic or pedestrians, thereby reducing the risk of accidents.

A complete stop is particularly crucial because vehicles exiting a driveway or alley are often at a lower elevation than the road, making visibility more challenging. By stopping first, drivers can ensure that they are making a safe transition onto the roadway, helping to keep both themselves and pedestrians safe. This practice aligns with traffic safety regulations and promotes responsible driving behavior.