Sofia Tatra T4DM 4080 and 4035 on bul. Konstantin Velichkov. August 2015.<BR>
As for these motorcars trailers do exist, it is rare to see two motorcars operating together.
Here a view in the normally very dense trafic on bul. Konstantin Velichkov. 

Photo by M.Koblischka
#m.koblischka@mx.uni-saarland.de