1. There is no difference between them.
  2. Traffic sign 306 alerts about a pedestrian crossing ahead, while traffic sign 135 marks the place of the crossing.
  3. Traffic sign 135 is placed in non-urban roads, while traffic sign 306 is placed in freeways.
  4. Traffic sign 135 alerts about a pedestrian crossing ahead, while traffic sign 306 marks the place of the crossing.
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