Mr. Declan Fitzpatrick:

It depends on whether it is a single-operation runway or, as in the case we are dealing with here, there are simultaneous segregated operations. The specific requirement for the 30° turn comes from the fact we are dealing with two segregated runways operating simultaneously. If a single-runway operation were in place, the aircraft could continue straight on out. The regulation allows that in circumstances where only one runway is operating at a time.