Splitting up roads
Splitting roads into two single segment for both lanes should only be done when it is needed for navigion. The fact that a road is physically splitted, is not a reason. With Junction arrows you can make sure that physically impossible turns are restricted. Splitting (or unsplitting) an existing road should only be done after consulting with the area or region manager. Be aware that unsplitting a road takes about the same effort as splitting it. See also the Road Aspects page.