A method performed by at least one apparatus is described, said method comprising: obtaining a routing request for determining a route between a first position and a second position in a transport network of a map; determining or triggering determining alternate routes between said first position and said second position at least based on costs of a first cost type for travelling a respective route; and determining or triggering determining costs of a second cost type for travelling a respective route for at least one of said alternate routes, wherein said second cost type is based on a probability of an unexpected traffic event on a respective route.