I've lived in (and outside) Paris. Worked there too. For years. Walked. Biked. Buses. By subways. By car, own, taxis, ubers. Going by a mix of foot, bike, bus/

I've lived in (and outside) Paris. Worked there too. For years. Walked. Biked. Buses. By subways. By car, own, taxis, ubers. Going by a mix of foot, bike, bus/metro has _always_ been faster, more flexible and less costly than by car. The only exception is when you've got a large/heavy package to pick/deliver. No amount of additional cars will improve the trafic there.