Traffic engineers use sensors to monitor the flow of cars on the highway. These sensors communicate with traffic lights, adjusting the timing of green lights based on the _______ of vehicles on the road to prevent congestion.
9
readingWhich choice completes the text with the most logical and precise word or phrase?
A
density
B
origin
C
intelligence
D
beauty
Correct Answer: A
Choice A is the best answer. Traffic lights adjust based on how many cars there are. "Density" refers to the number of individuals/objects in a given space.
Choice B is incorrect because "origin" refers to source. Choice C is incorrect because cars do not have "intelligence" in this context. Choice D is incorrect because "beauty" is irrelevant to traffic flow.