     { type: 'motorcycle', value: 'black' }
   ]
 
-warning_railroad
+warning_railroad:
   category: 'warning'
   name: 'railroad'
   elements: [

    { type: 'turn-reverse-right', value: 'black' }
  ]

warning_turn_reverse_left
  category: 'warning'
  name: 'turn reverse left'
  elements: [

    { type: 'falling-rocks', value: 'black' }
  ]

warning_hairpin_curve:
  category: 'warning'
  name: 'hairpin curve'
  elements: [
