Tbilisi's bus network forms a crucial backbone of the city's transit system. For almost a decade, up to 700 outdated buses of various size were serving the city, majority of them were Ukrainian Bogdan A144 and A092 models. Nowadays the city has an extensive network of municipal buses, including a growing number of night bus services. In August 2020, the mayor of Tbilisi Kakha Kaladze announced major changes in the existing public transit system. Notably, the city will introduce 10 Bus Rapid Transit corridors in the nearest future, served by large 18 meters long buses, running with significantly shorter intervals. These services are named TBT(Tbilisi Bus Transit) lines and are indexed numbers from 300 until 310. Besides the TBT lines, the new system includes 44 city and 185 local lines, totalling up to over 240 bus routes within the city.