A line system (24) for a road miller, which rotates along with the milling roller (11) and which supplies water directly to the nozzles (23) which are arranged on the lateral surface (18) of the milling roller (11), to be arranged in the milling roller (11). Owing to the line system (24), the milling roller (11) no longer needs to be filled with water. The nozzles (23) are instead supplied with water directly from the line system (24) in order to spray the milling region selectively.