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Objects"},{"t":"Raise drawbridges and observe passage of water traffic or lower drawbridges and raise automobile gates.","imp":4.82,"exp":15,"src":"heuristic","tier":null,"gwa":"Monitoring Processes, Materials, or Surroundings"},{"t":"Maintain and guard stations in bridges to check waterways for boat traffic.","imp":4.78,"exp":20,"src":"heuristic","tier":"efficient","gwa":"Monitoring Processes, Materials, or Surroundings"},{"t":"Record names, types, and destinations of vessels passing through bridge openings or locks, and numbers of trains or vehicles crossing bridges.","imp":4.68,"exp":35,"src":"heuristic","tier":"efficient","gwa":"Documenting/Recording Information"},{"t":"Observe approaching vessels to determine size and speed, and listen for whistle signals indicating desire to pass.","imp":4.65,"exp":15,"src":"heuristic","tier":null,"gwa":"Monitoring Processes, Materials, or Surroundings"},{"t":"Move levers to activate traffic signals, navigation lights, and 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