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(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.
     Okay, a few drivers prefer to travel alone due to the stated benefits, but what about the probable decrease from those who avail the financial incentives 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.
      Overall, what this choice says is that the plan may not be effective as people who CAN avail are less in number, but people who are relatively high in number DO NOT get benefitted much. 
       Let's hang onto it. 

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.
     What about evaluating the plan's effectiveness? if anything, this will slightly strengthen not weaken. 
      
(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
     This is a tricky choice. Even if the traffic congestion due to commercial vehicles doesn't improve, conclusion is talking about the reduction in traffic congestion by reducing the number of single-occupancy vehicles on the road. what about the decrease that comes from the single-occupancy vehicles? what if there is decent decrease from this? 

(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.
     It just states that the implementation of this plan is costly. This will not weaken the effctiveness of the city's plan to decrease traffic congestion.

So, the right answer choice is B. 
 ­
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­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.



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­Plan's motive- reduce congestion by carpooling- provide tax incentives to encourage plan
Assumption- By reducing single occupancy vehicles, overall traffic will reduce.
Notice- the argument talks about carpooling to share rides and the assumption's intention is to reduce 'overall traffic'. There is a slight jump.

My thought- what if the single occupancy vehicles are not the cause of most traffic or even if the carpooling plan works out, traffic doesnt decrease?

Option A and D seem most relevant-
A- Ask 'So what?' to the option. Okay, many people 'prefer' to travel alone because of said reasons. Okay, this may cast doubt but not very much.
D- If most congestion is due to commercial vehicles, and even if the plan works out, it will not be effective since the congestion will remain because of comm vehicles. Hence D is a stronger weakener. Thus D.
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­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.

Things to consider: Tax incentives encourages drivers to share rides which will reduce the number of single-occupancy vehicles and this will result in a reduction of traffic congestion.

So, single-occupancy vehicles are actually the only reason for traffic congestion, single-occupancy vehicles can not be reduced even after offering Tax incentives, the city's plan would be doubtful.

Now, consider (D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.

 Based on this, single-occupancy vehicles are not being reduced even after Tax Incentives.

Answer D.
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(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling. #still other remainging may carpool, traffic may decrease

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.#still there will be decrease bcoz of rich carpoolong

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.#we need to evaluate effectiveness of plan

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space. #Correct. the plan may not work bcoz traffic is bcoz of commercial vehiche

(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.#Irrelevant

Answer D­
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­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. => CORRECT

(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.
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A. Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.

This option suggests that the carpooling initiative may not significantly change driver behavior, as many drivers may still choose to drive alone. This directly challenges the effectiveness of the plan.

B. The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.

While this option addresses an inequality in the plan, it does not directly challenge the assumption that reducing single-occupancy vehicles will reduce traffic congestion. It focuses on who benefits rather than the overall impact on traffic.

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 option introduces a variable that might independently reduce congestion but does not directly challenge the carpooling plan's ability to reduce single-occupancy vehicles.

D. Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.

This option directly challenges the core assumption by stating that the primary cause of congestion (commercial vehicles) is not addressed by the plan. This implies that even with increased carpooling, congestion may not significantly decrease.

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 option highlights a financial concern but does not directly address whether the carpooling initiative will reduce traffic congestion. It focuses on the opportunity cost rather than the effectiveness of the plan.


ANS: D. Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
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In a nutshell, the plan is as follows: people want tax cuts -> people share rides -> fewer cars on the road -> less traffic.
Therefore, to find a weakener, we need to ‘attack’ any of these steps in front of us.

B undermines tax incentives, but not directly – perhaps wealthy people will still prefer carpool.
C suggests another pathway of traffic development altogether, so is irrelevant.
Epoints out the weakness in the plan and a potentially more effective alternative, but given the argument doesn’t state their option is ‘the best’, this is not a weakener.

The two plausible options are A and D. And while A is tempting, it basically says that many people still like driving alone – but even so, the traffic congestion may decrease, albeit marginally.
However, D actually undermines the whole plan from the get-go: because the congestion is originally caused by industrials vehicles, the whole planning and thinking goes in the wrong direction and is not helping anyone.

Hence, D is the right answer.

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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.



­
 


This question was provided by GMAT Club
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­
­The conclusion is concerned about decrease in traffic volume regardless of the extent.

A. Even if many drivers prefer riding along, other drivers who follow carpooling will impact the traffic decrease.
B. If lower income drivers are not receiving the incentives then they are not likely to follow carpooling. Even if the tax incentives are provided to higher income drivers, then they might still not follow carpooling because they are in a high income bracket and might not care for the incentives. Keep.
C. Whether or not carpooling will have an effect is in contention. This argument is irrelevant.
D. Even if most traffic is due to commercial vehicles, the remaining traffic which is attributed to private vehicles can still contribute to the reduced traffic through carpooling.
E. Regardless of what it would cost the city, whether the traffic will reduct is the contention. Irrelevant.
­
I appreciate your argument - this is a great line of thought! We may use it for another question one in the next competition. 
However, nothing says that this will result in less participation by the higher-income drivers, only that lower income drivers will not be engaged, so we have to make further assumptions to make this answer choice work. 
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­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?

The answer is D;

(A) Many drivers prefer to travel alone due to the flexibility and privacy it offers, even when financial incentives are offered for carpooling.
But many driver ll prefer to have financial incentives so it ll surely decrease some congestion even if many drivers dont follow that.

(B) The tax incentives provided for carpooling are structured to disproportionately benefit higher-income drivers, potentially leading to less participation among lower-income commuters.
Still it will decrease the congestion. Small or large does not matter.

(C) Public transportation systems are likely to see an increase in use due to higher awareness of environmental issues, regardless of the carpooling initiative.
Not a related issue. No link to statement.

(D) Most traffic congestion is due to commercial vehicles, which are not affected by carpooling incentives as they cannot realistically share vehicle space.
City is trying to solve a problem by financial incentive but that's not actually the real problem. As stated in D, the real problem is not individual cars but commercial vehicles.

(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.
Other traffic measures are not mentioned. Moreover, so cost ll be saved from reducing the congestion.
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