It's also dishonest to not include an answer for personal transportation. "Public transit" is a handwavy answer, since obviously if personal transportation means are removed, more public transit will be needed, meaning more vehicles (be it trains, buses, or taxis) will be on the road.
Unless your solution is that people should just move less?
To be fair, if people just stayed in their houses and didn't use electricity or water and stopped eating and just died when they ran out of food then we could have the whole CO2 problem wrapped up for a good 1,000 years or so in about 40-60 days, assuming they also took the time to gracefully shut down any operating machinery and safely disposed of any hazardous chemicals while waiting for their impending death.
Humanity might go extinct in the process, but they would have at least stopped further destroying the only planet they have to live on in the process.
Argument that we'll need to live with 5% or 10% or 20% of traffic we have today, so we can as well do nothing is dishonest.