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Designated bike lanes have reduced traffic-related accidents by 43 percent in other cities. the first choice so lets skeetttt
The  fact that best supports the city planner’s opinion is that the designated bike lanes have reduced traffic-related accidents by 43 percent in other cities.
What do you mean by downtown?
The phrase "downtown" is primarily used by English speakers in North America to describe the physical, historical, commercial, and occasionally even cultural center of a city.
In the scenario, the city planner's thought is in favor of reconstructing the downtown streets, bike commuters friendly. He gives an inference that riding bikes and cycles help in reducing the percentage of accidents.
To learn more about city planner and bike commuters here
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