original_query: What are the types of signs that indicate different locations on the expressway network of China?
query: What are the types of signs that indicate different locations on the expressway network of China?
answer: Signs on Chinese expressways indicate exits, toll gates, service/refreshment areas, intersections, and warn drivers to maintain safe distances.  Exit signs are posted at various distances before the actual exit.  There are also signs about speed checks, road conditions, and overtaking lanes, primarily in Chinese but also in English on many expressways.