Final answer:
Bus lanes on the Gyeongbu expressway (Highway #1) are designated for specific vehicles to improve traffic flow and promote public transportation.
Step-by-step explanation:
Bus lanes on the Gyeongbu expressway (Highway #1) have been designated to be used only by certain vehicles, such as buses, taxis, and emergency vehicles. These lanes are aimed at improving traffic flow, reducing congestion, and providing a more efficient transportation system. By restricting access to designated vehicles, bus lanes help prioritize public transportation and encourage people to use buses instead of private vehicles. This promotes sustainability, reduces air pollution, and contributes to more sustainable urban development.