{ "street_nodes": { "R1": [ 4.25, -2.37 ], "R2": [ 20.47, -2.37 ] }, "space_nodes": { "S1": [ 20.47, 6.8, 1.57 ] }, "roads": { "road_1": [ "R1", "R2" ], "road_2": [ "S1", "R2" ] } }