Road space in cities is a zero-sum game. Currently cars command the vast majority of it, with obvious consequences.
Highly efficient uses of space, like dedicated bus lanes, directly transfer road space from cars to improve transit. This necessarily makes driving "worse" in the short term, until enough marginal drivers shift to the now-improved busses, leaving the car lanes quicker and less congested.
In most cities, cars are physically obstructing better transit, which makes traffic worse for everyone involved.
Highly efficient uses of space, like dedicated bus lanes, directly transfer road space from cars to improve transit. This necessarily makes driving "worse" in the short term, until enough marginal drivers shift to the now-improved busses, leaving the car lanes quicker and less congested.
In most cities, cars are physically obstructing better transit, which makes traffic worse for everyone involved.