Answer:
The purpose of the passage was too make citizens of Darlingham happy and pleased with the idea.
Step-by-step explanation:
The most helpful part was when the author put in statistics and facts about safety from putting on the traffic lights, and having very clean points that get to the point. However, it was unnecessary to say that his grandpa worked at Wilton Smelting company which I assume is a company where traffic lights are made, thus making his entire statement seem bias.