Car-free city centre

There are different opinions about the idea of a car-free city centre. Traffic jams are very common and it annoys tourists. Tourism is an excellent source of income for a big city but tourists often complain about the traffic which makes their vists difficult.
Nevertheless, they are not the only people we need to worry about. People’s opinions who live and work in the city centre are more important. With a car-free city centre residents would have to leave their cars very far from their homes or enterprises every day. It would be more annoying than a few days visiting a city as you are when you are a tourist. 

But on the other hand, if an emergency happens we need prepared roads for the police cars and ambulances, and if these roads not are used very often they could not be ready for the traffic.
In my opinion, the best solution is a city centre used by residents. So there will be less traffic and people who really need to drive into the city centre will be able to do it.

I am a little confused about your solution. Are you suggesting a city centre for residents only and no tourists? This is the line that confused me...In my opinion the best solution is city centre is used by resident. Other than that this was very understandable so I just made some minor corrections. 

Free car city centre

there are different opinions about the idea of a car free city centre. Traffic jams are very common and it annoys tourists. Tourism is an excellent income for a big city but tourists often complain about the traffic which make their visits difficult.
Nevertheless, they are not the only people who we need to worry about. The opinion of the people who live and work there are more important. With a car free city centre they would have to leave their cars very far from their homes or businesses every day. It could be more annoying than a few days visiting a city as it happens when you are only a tourist.

On the other hand, if an emergency happens, we need the roads ready for the police cars and ambulances, and if these roads are not used very often, they would be ready for the traffic.

In my opinion the best solution is that the city centre is used by the residents. Accordingly there will be less traffic and the people who really need to drive into the city centre will be able to do it.