Sri Lanka Transport Board
The Sri Lanka Transport Board (Sinhalese: ශ්රී ලංකා ගමනාගමන මණ්ඩලය Sri Lanka Gamanágamana Mandalé, Tamil: இலங்கை போக்குவரத்து சபை Ilaṅkai Pōkkuvarattu Capai), abberviated as SLTB, is a bus service provider in Sri Lanka. Between 1958 and 1978, the Ceylon Transport Board (CTB) was the nationalised enterprise which handled all public bus transport in Sri Lanka.
Source: Wikipedia — Sri Lanka Transport Board (CC BY-SA 4.0)