What does sign E4 indicate about turning?

The indication of sign E4 is specifically related to the regulation of turning at an intersection. This sign is used to clearly communicate to drivers that a left turn is prohibited at the upcoming junction. This is crucial for traffic management and safety, as it directs drivers to be aware that they must continue straight or take an alternative route if they wish to turn left. Understanding such signage helps prevent confusion and potential accidents at intersections, ensuring that traffic moves smoothly and safely.

The other options suggest turning actions that would not be permissible under the constraints set by the E4 sign. A driver encountering this sign must recognize that left turns are not allowed, simplifying their choices to either proceed straight or make adjustments as needed to comply with other traffic regulations.