Along Highway 1, traffic is very tightly controlled by

Question

Along Highway 1, traffic is very tightly controlled by traffic lights placed every half mile to cut down on speeding. Motor vehicle accidents, however, are more common along Highway 1 than on any other road in the city. Clearly, this problem can only be solved by adding more traffic lights to the highway, reducing speeding even more.

Which of the following, if true, casts the most doubt on the effectiveness of the solution proposed above?

The average speed on Highway 1 is already 35 miles per hour, making more traffic lights unnecessary.
 The city council does not have sufficient funds budgeted for improvements along Highway 1.
 Highway 1 is the longest road in the city, making motor vehicle accidents statistically more likely.
 Most motor vehicle accidents along Highway 1 are rear-end collisions that occur when one of the parties is unable to stop safely at a traffic light.
 There are more traffic-light controlled intersections on Highway 1 than there are on- and off-ramps.

OA is D

while I cannot refute the OA, I am also not sure why is C wrong. By proving that data is statistically wrong we are also invalidating that speeding is not the reason for the accidents which makes the solution ineffective. Because the solution focuses on reducing speeding and we have invalidated it by saying that the data collected itself is wrong and accidents are not happening because of speeding.

Chetangupta · Answer

I am not good at verbal but here is my take:

Problem 
 traffic is very tightly controlled by traffic lightsto cut down on speeding. Motor vehicle accidents are more common 
 Solution 
 this problem can only be solved by adding more traffic lights to the highway, reducing speeding even more. 
D days that using more lights may result in vehicles not stopping properly, so weakens the solution.

C does not say that speeding is not the reason, could be anything. but d offers a better choice. Put this and see if it weakens.

agdimple333 · Answer

conclusion is - this problem can only be solved by adding more traffic lights to the highway, reducing speeding even more.

C no where weakening this..

Highway 1 is the longest road in the city, making motor vehicle accidents statistically more likely.

even if highway 1 is the longest road, more lights can be added and speed can be reduced.

whereas D clearly says that additional traffic lights wont solve the problem.

pkonduri · Answer

conclusion is - this problem can only be solved by adding more traffic lights to the highway,  reducing speeding even more .

what i am saying here is what if speeding is not the issue. the argument says speeding is the issue. lets say there are X number of street lights and may be they are sufficient. the argument assumes that as the number of accidents are more compared to any other road and concludes that speeding is the reason for this issue and proposes a solution to reduce speeding. Option C says that there are more people traveling on the road resulting in more number of accidents and may be speeding is not the issue. if speeding is not the issue how can the solution provided be effective.

agdimple333 · Answer

lets look at it this way -
argument reads - there are more accidents - because of high speed - because of less lights,
soln to the problem is --> more traffic lights --> reduce speed --> less accidents, question that is asked to us is, what it is that doubt the solution of adding more traffic lights?

if road is longest and there are stats --> Does it help you to determine anything on traffic lights? or anything on speed? answer - No.

most of the accidents are from rear end AT TRAFFIC LIGHTS. - suppose that it does not create doubt on the solution and so more lights are added. it may reduce the speed but will it stop the ultimate goal of reducing accidents? infact the accidents will be more.

rukna · Answer

I am also confused with this easy questions. 
I have exact same doubt as the poster of this question.

Clearly, D is right.

BUT C also invalidates the premise by saying that the no does not reflect true picture ---> This, Highway 1 does not have max accidents ( say per km) but overall no are high because highway is very long.

But if carefully observe, that all that can be deduced from C. SO even if thats true, we need to focus on why adding more lights will not help. It might be weakening a bit but of the options, D is best.

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Along Highway 1, traffic is very tightly controlled by

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