Final answer:
The three indicators that prohibit a right turn at an intersection are a "No Right Turn" sign, a red traffic light, and certain lane markings that indicate a turn is not permitted. A left turn only sign or a stop sign does not necessarily forbid a right turn without additional indicators.
Step-by-step explanation:
There are several indicators that a driver must not turn right at an intersection based on traffic signs and signals. A "No Right Turn" sign explicitly forbids turning right. When facing a red traffic light, drivers are required to stop and may not turn right unless a sign indicates that turning right on red is permitted in that jurisdiction. Specific lane markings can also indicate that a right turn is not permitted, such as an arrow pointing straight or left, suggesting the lane is solely for through or left-turn traffic.
In contrast, a "Left Turn Only" sign would indicate that you may only make a left turn from that lane and a stop sign would require you to stop fully, not specifically prohibiting right turns unless other signs are present. The signs such as "U-Turn Allowed," "Straight Only," or a pedestrian crossing sign do not inherently forbid a right turn unless accompanied by other traffic control devices or regulations.