What sign indicates no turns are allowed?

Answer: A — red circle with a white bar across it

A red circle with a white bar across it is a universal symbol indicating that no turns are allowed at that intersection or location. This sign communicates to drivers that they must not make any turns, ensuring that traffic flow remains clear and preventing potential conflicts or accidents. In many traffic control contexts, red circles signify prohibitions, while the horizontal white bar indicates a specific restriction on movement. Understanding this sign is crucial for drivers to comply with traffic regulations and maintain safe driving practices. Other choices represent different regulations or signals. A yellow triangle with an arrow typically indicates a warning, making drivers aware of changes or conditions ahead. A green circle often signifies permitted movements or directions, while a blue square with a white stop sign may denote information that is not focused on prohibitions in the same context.