Originally Posted by
Red Dragon
In an ICAO environment the departing aircraft needs to have crossed the upwind end of the runway prior to the arriving aircraft crossing the landing threshold. This assumes no reduced runway separation (RRSM) is being used. How the tower controller achieves it is usually based on experience, but will be dependent on weather conditions also i.e. VMC/IMC.
Or on a nice sunny day: Wheels up before Wheels down!
