Ditch's and main roads are OB and beyond unless the current fairway for that hole crosses the ditch or main road. All concrete and asphalt is OB with exceptions for picnic tables. Picnic tables are a casual hazard, players can choose to play the disc where it lies or take relief on the line of play up to 1 meter behind the concrete pad (obviously no closer to the pin). Where rock walls designate OB: OB line continues straight through short breaks in wall and OB lines turn 90 degrees toward road where wall ends.