I saw some threads regarding mixed use being considered at LHR, and I had to think of some earlier observations:
AMS has many runways, that are always use for either TO or landing, but never mixed. The only runway that would realistically be able to handle this would be 18C-36C, but it doesn't happen (nor should it have to, with such an abundance of runways). Apparently LHR is similar.
At MUC, there are two parallel runways that would allow for TO on one runway, landing on the other. Yet both runways are used for mixed operation, and I have spent many times waiting up to 20 mins. to take off there, because heaps of planes were getting in.
There are plenty of other airports with two (or more) parallel runways, but I am not familiar enough with them to include here.
My question: does mixed use really increase capacity? Having two runways available for landing is better than one of course, but you'd have to slot in the take-offs in between. If you have one for take-offs only, then you can pretty much keep firing aircraft at the maximum capacity without having to worry about incoming aircraft. So what's the trade-off between the two?
Could anyone provide some numbers or other experience?