<p>Nah, read slide 5 on the first URL. Basically, the bus emits ultrasonic waves to keep cars too tall from entering. </p>
<p>I don’t get what trucks and vehicles bigger than 2 meters will do though. Go around it, I guess? I know in my home city, Ahmedabad, the city built a ‘middle’ lane which was exclusively for public buses. It actually reduced traffic by a LOT.</p>