Cut single lane into two lanes
The Lane Chop Tool can be used to cut a single lane into two lanes at a desired location. Chopping does not have an immediately visible effect, but it enables you to make instantaneous changes in lane properties or have lanes start or end abruptly.
On the RoadRunner toolbar, click the Lane Chop Tool button:
Click the Lane Chop Tool button.
Click the road you want to edit.
Move the mouse cursor to the location you want to chop. You will see a light blue line indicating where the chop operation will take place.
Right-click to chop the lane at the desired location.