The Guideline sign indicates that drivers should adhere to specific rules or guidelines regarding the road ahead. It often provides information on how to navigate the road safely, such as directions or restrictions. In general, these signs help ensure safe and orderly traffic flow by informing drivers of necessary actions or precautions to take in relation to the road conditions or regulations that apply in that area. If you have a specific sign in mind or an image you'd like to share, please provide it and I can give you more detailed information.