In my opinion, I think the policy can reduce open access or traffic congestion externality only for some instances. By having more highways and public transportation, it may help reducing the number of people using the car but at the same time you increase more car on the road as well. Also, the way they implement the new highways will mess up the existing railroad system. Therefore, the policy that they have will not help reducing the traffic congestion in Bangkok since they are not solving the problem from the root cause of the problem. Furthermore, the incidence of the policy seems to fall on every household in Bangkok but I believe that the rich will suffer more from this policy. First, the government will raise more tax in order for them to generate more revenue and the tax rate will be a progressive tax and they likely to use a highway than the poor since it links to the city area where they work. Second, people who have car in Thailand considered as a rich people, which means that the poor tend to use public transportation such as sky train and buses. Moreover, the government in Thailand is more likely use the revenue that they have to maximize their own interest according to public choice economics theory. Hence, the government will spend that amount of revenue in order to gain the vote for the next election but not maximize the society interest