{
 "layers": [
  {
   "layerId": 104,
   "layerName": "TrafficDevices",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
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     "height": 20,
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    },
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    },
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    },
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     "values": [
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    },
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     "url": "238a1daf250b2a35c7432cd6c4abb336",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAhklEQVQ4je2QwQ2DMAxF34GBugHZhC5CndBF6Cb2Bh6JS0BIlQIBjnlSZEWynr/d8TBdEzbhRsxV87sljJ+3CIC5ibmm3YBqYehfQcZBABgH+P6STHPap64V9gctdcI/zA0KdzwSxmlOmJusSfMNLwsBormquYb1X2o+u7KWUl0RnqYJ77MAxC8oEpBX3R0AAAAASUVORK5CYII=",
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     "values": [
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAfklEQVQ4je3Qyw3EIAwE0DmkEOgkrsykMtPJTCl7IdFKq0A+e2QkhEDWw3jBn7NMcIJHSttrW6/AYmYOAJKc5Pb1wG1wzTm7mR0XEeERgTN0CKaUBiX3wJ9IAjpzHIElIiDJ907bDB+DAFBIVpLrfu4VX/1y7XX1BLycCb7PBxkMKQJT2uqxAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "1",
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   "legendGroups": [
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     "heading": "Signal Type"
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}