The sign you referred to is known as the "Guiding threshold with guide post ascending right." This traffic sign indicates a curving road, where there is a gradual incline to the right. It is typically used to inform drivers about the road’s alignment, helping them prepare for the upcoming change in direction.

Drivers should be aware that this may affect their vehicle handling and speed, especially in adverse weather conditions. It’s important to reduce speed and be cautious when navigating through this type of road. Following the sign’s guidance contributes to safer driving practices.

If you have any more questions about this sign or other traffic rules, feel free to ask!