The colouring of the risk zones mark areas where effects of an event are to be expected. The three colours (yellow, orange, red) can help assessing the effects an event. However, they must always be considered in combination with the event level (level 1 to 5), indicating the impact and extent of an event.
As a general rule, travellers or objects located within the risk zones may be affected by the event. For individual travellers, extensive disruptions are also possible within the yellow risk zone. It is therefore advisable to always check whether the trip is affected by an event.