Shown here is an example of a board where the customer needs to layout the power rails across one edge of the board. This is a common concern, so there are certain things that need to be done when the traces can not be kept short. Keep the traces tight, and make sure that there is not a lot of inductance in those gate drive traces. The designer is going to dry run these traces a long distance, they are noise generators, so keep the noise away from any of the signal path in the system. One of the ways to do this is to shield these with ground planes, or use a positive rail plane to act as sort of a Faraday shield and if there is no ground plane then these traces would look like a monopole, and they would radiate significantly more. With these shields around them there is far less radiation.