Gets road network config from database

Example response

{
  "city": "Santa-Clara",
  "intersections": [
    {
      "name": "i1",
      "segments": [
        {
          "id": "id1",
          "points": [
            {
              "lat": 10.5,
              "lng": 50.4,
              "alt": 25.4
            }
          ]
        }
      ]
    }
  ]
}