The last company I was at set the meeting times to end 5 minutes before the end of the hour (or half hour) to prevent this issue. It helped but wasn't complete

The last company I was at set the meeting times to end 5 minutes before the end of the hour (or half hour) to prevent this issue. It helped but wasn't completely effective since we were split over 3 floors of a building (floor 4, 20 and 21), so it could take over 5 minutes to get from room to room.