Under what condition is it illegal to make a right turn on red in Indiana?

In Indiana, making a right turn on red is generally permitted after a complete stop, unless there are specific conditions that prohibit it. One of the key conditions that makes it illegal to turn right on red is when a sign explicitly indicates that such a turn is prohibited. This reinforces the importance of obeying traffic signs and signals, as they are put in place to ensure safety and proper traffic flow.

Additionally, when pedestrians are present in the crosswalk, drivers must yield to them, and it would be illegal to make a right turn on red at that moment, as it could endanger pedestrian safety. Moreover, if a traffic light is not functioning and there is uncertainty about the right of way, turning right on red could also be considered illegal in some situations since drivers should treat the intersection as a four-way stop and exercise caution.

Given these conditions, the option indicating that it is illegal to turn right on red encompasses all these scenarios, including the presence of sign prohibitions, pedestrian crossings, and malfunctioning traffic signals. Adhering to these rules is crucial for the safety of all road users.