Tsar Boris III Boulevard is the main road that goes south-west at the direction of the city of Pernik. This actually is the old road to Pernik as since Lyulin highway was released the traffic at Tsar Boris III Boulevard significantly decreased.
The road is important as this is the road that goes to the highway for Greece. Many Bulgarians are traveling for the holydays to Khalkidhiki and Thessaloniki and this was one of the busiest streets in Sofa. Furthermore many citizens of the near city of Pernik are working in Sofia and they used to go through Tsar Boris III Boulevard on a daily basis.