A 'No Turn on Red' sign means:

Most states allow drivers to make a right turn on a red light after coming to a complete stop and yielding to all traffic and pedestrians — but only where this is not prohibited. A 'No Turn on Red' sign overrides this default and prohibits the turn at that intersection during the red light phase. Right-on-red is prohibited at intersections where it would be unsafe due to limited sight distance, heavy pedestrian traffic, complex traffic patterns, or curved approaches. Some states (notably New York City) prohibit right-on-red as a general default, with exceptions only where allowed by a sign. Always come to a complete stop before turning on red where it is permitted; rolling stops are the most common violation in this scenario.