Final answer:
The purpose of increasing taxes on gasoline is to reduce its consumption and promote alternatives to reduce noise pollution and traffic congestion.
Step-by-step explanation:
The purpose of the government's decision to increase taxes on gasoline is to reduce the consumption of gasoline. By increasing the cost of gasoline through taxation, the government aims to discourage its use and promote more sustainable alternatives. This decision serves the goals of reducing noise pollution and traffic congestion to their optimal levels.