It is possible to make an automatic transmission shift when you want it to. To make the vehicle shift up to a higher gear (from first to second, second to third), simply ease up slightly on the accelerator.
To shift into a lower gear (from third to second, second to first) for passing, or to get out of an emergency situation quickly, push the accelerator to the floor.
To slow a vehicle going down a steep hill, shift to a lower gear when necessary. Try to remember to do this at the top of the hill.