My short essay [need a basic check]

In my opinion, banning private transport such as cars and motorcycles from the city centers is in theory, [this was added because you make it sound as if banning traffic was the only good idea where in the second paragraph, you list the other side] a good idea [no comma here] because there would not be any congestions anymore. What is more, people and tourists would have safe pedestrian-only zones, so it would help to attract more tourists to visit our city monuments. [Of course, distances are quite long, so deliveries and public transport should be allowed.] This sentence contradicts the rest of your paragraph. I have made changes to the first sentence that incorperates this sentence.

On the other hand, this solution is quite inconvenient and it would take a lot of time to make it popular with people. Instead, I believe that there are some alternative solutions such as charging cars for driving into the city centers. Incoming money could be used to create more car parks [is it a lack of car parks that creates traffic or too many vehicles on the road at once?]. Also cars could be allowed only on alternate days.

To summarise, banning private transport from our cities‘ centres could cause even more inconveniece than it is worth. That‘s why I personally think that traffic should be reduced only in particular days and during the cities fiests a small charge should be taken. In my opinion it could help to reduce the heavy traffic problem.

[Overall, very well written. I love how you alternate your beginings (of the sentences). That makes the paragraph so much more interesting to read and all the more worthwhile. Keep it up! =D]

"Cities" centres was such a stupid mistake because the correct form was written in my English book...  Thank you poci_wasiats for spotting it :]

And thank you Anonymous for your help :}