Bunuel
Urban Planner's Claim: The city plans to reduce traffic congestion by implementing a carpooling initiative that encourages drivers to share rides by offering tax incentives. The plan is based on the assumption that by reducing the number of single-occupancy vehicles on the roads, overall traffic volume will decrease.
Which of the following, if true, raises the most serious doubt regarding the effectiveness of the city's plan to decrease traffic congestion?
(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.
(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.
(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.
(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures.
Let's evaluate each option, while keeping in mind that we are looking for an option that most
strongly raises a doubt about the plan's effectiveness to
reduce overall traffic volume:
(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.
-> This implies that the plan won't be perfectly effective because a lot of drivers still won't carpool, but as it isn't all drivers, this implies the plan will still reduce overall traffic volume to a certain extent.
(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.
-> This is talking about a "potential" issue, and isn't the most serious doubt as implies the plan will still reduce overall traffic volume to a certain extent.
(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.
-> This is an alternative method to get the same result (to reduce overall traffic volume) but it doesn't raise a doubt on the plan's effectiveness.
(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
-> This strongly challenges the assumption that reducing single-occupancy vehicles will reduce traffic volume because based on this, traffic volume is NOT caused by single-occupancy vehicles so a plan that targets them and enables more carpooling will not be effective. This is the correct answer.
(E) The tax incentives for carpooling will initially cost the city a significant amount in lost tax revenue, which could have been used for other traffic reduction measures.
-> This is a financial concern and doesn't talk about reducing overall traffic volume through carpooling.
The correct answer is
D.