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  4. In 1920 Detroit police officer William Potts had the idea to add this signal to make simple stop/go traffic lights safer

In 1920 Detroit police officer William Potts had the idea to add this signal to make simple stop/go traffic lights safer

Since you have landed on this page then most probably you are looking for the In 1920 Detroit police officer William Potts had the idea to add this signal to make simple stop/go traffic lights safer answer. This question was last seen on February 15 2023 Jeopardy TV Game Show.

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For more questions from this episode visit Jeopardy February 15 2023 Answers