What must a driver do when entering a road from a driveway or alley?

When a driver is entering a road from a driveway or alley, the most important action is to yield to vehicles that are already on the main road. This ensures that the driver assesses the traffic conditions and allows any vehicles or pedestrians the right of way, promoting safety for everyone involved. Yielding means that the driver must look for any oncoming traffic or pedestrians and allow them to pass if necessary before proceeding onto the main road.

Following this rule helps prevent accidents and maintains a smooth flow of traffic. The requirement to yield in this scenario emphasizes the importance of caution and awareness when merging into busy traffic, ensuring that drivers do not cause disruptions or hazards as they enter the roadway.

The other choices would not adequately address the responsibility of the driver when entering traffic from a private space. For instance, accelerating without yielding could lead to dangerous collisions. Stopping and waiting for a green light is not applicable in this context since driveways and alleys do not control traffic signals. Signaling only after pulling onto the road fails to inform other road users of the intent to merge beforehand, which is crucial for maintaining safe driving practices.