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Public transportation
Since As the amount number of cars on the streets notably increased, public transportation was became expected to reduce the countless number of cars,  that results in traffic jams; However, despite introduction of public transportation, the actual number of cars remained the same. For instance, Iin Brazil the public transportation is uncomfortable and ineffective.
The Public transport lacks comfort and security. To illustrate, at bus stops in Rio de Janeiro there are not air conditioners or and enough seats; besides that, the buses are always crowded and people have to stand on them. All this considered(/because of this), a few people who could use forms of public transportation drive cars due to the ineffectiveness of them(/their ineffectiveness).
The increase in of cars on the streets not only results in traffic jams, but also causes environmental issues, as well as air pollution due to CO2 and CO emission, littering, and wastewater by industries which build cars(/the creation and disposal of waste water by the automobile industries). Indeed, cars, as a result of egregious of public transportation, contribute to all of those dilemmas.
In conclusion, it's necessary to analyze the situation, and improve the ways of transportation in the cities(/and improve urban transportation options); moreover, it is also important to upgrade comfort and security so that people use public transportation instead of "private transportations". Therefore, This will cause air pollution will decrease, littering will decrease, traffic jams will decrease, and, likewise, life quality will increase.