In order to draw ESUs, please click the Add button next to the Elementary Street Units label, near the bottom of the pane and start plotting a line of the map as you would in Earthlight. When you double click on the last committed point an ESU will be created. To add another ESU to the same street click Add again and repeat the process. Please note that during the ESU creation and editing you can utilise Earthlight's snapping capability to create a topological road network. Please take a look at the screenshots below.
After the ESU is plotted you can define its direction using one of the Direction options
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