Based on game implementations like Gloomhaven (road/city events) or Battletech (travel events). For more info, see https://thepit.ja-galaxy-forum.com/index.php?t=msg&th=24865&goto=363481&#msg_363481 git-svn-id: https://ja2svn.mooo.com/source/ja2_v1.13_data@2599 4f8fa57e-7814-0410-bad4-adc449f26b7c