Final answer:
A pennant-shaped road sign indicates a no-passing zone and is crucial for driver safety on two-lane roads.
Step-by-step explanation:
A pennant-shaped road sign is used to indicate a no-passing zone on two-lane roads. This type of sign is typically positioned on the left side of the road and points to the beginning of an area where drivers are not allowed to overtake other vehicles. The sign is shaped like a sideways triangle, or pennant, and is often yellow with black lettering or symbols. It serves as a safety precaution, alerting drivers that it's not safe to pass due to oncoming traffic, road conditions, or limited visibility. Recognizing and understanding road signs are crucial for safe driving and are part of driver's education and tests.
For example, if you see a pennant-shaped road sign on a two-lane road with solid yellow lines painted on the center, it means it is unsafe to pass another vehicle in that area.
To summarize, a pennant-shaped road sign signifies a no passing zone, indicating that overtaking other vehicles is prohibited in that specific area.