Question About how many seconds in advance of a bus stop should warning lights be activated? Answers One to two seconds Two to four seconds Five to ten seconds 45 seconds Explanation If a school bus is equipped with alternating amber warning lights, they must be activated at least 200 feet, or about five to ten seconds, before the stop. Take a FREE Practice Test Now This questions appears in the following tests: District Of Columbia Bus , Indiana Bus , North Carolina Bus , Oregon Bus ,