Exactly, a bus that doesn't have its own lane is a failure, as they get stuck in traffic it'll always strictly slower than cars. So people—if they can help it—d

Exactly, a bus that doesn't have its own lane is a failure, as they get stuck in traffic it'll always strictly slower than cars. So people—if they can help it—drive cars, making more traffic, making buses slower, causing people to prefer more cars... While if they run in dedicated lanes there is a counterbalance: the more people drive the worse traffic is, making the bus a comparatively better option, making people drive less... :)