The first traffic light was installed in December 1868 at Bridge Street, Great George Street and Parliament Street in London. It exploded on 2 January 1869. What time of day did it explode?
According to a BBC article, the traffic lights exploded sometime in the evening:
But a month into the project disaster struck. One evening a leaky gas mains resulted in one of the traffic lights exploding in the face of the policeman who was operating them. He was badly burnt.
The project, so enthusiastically greeted, was immediately dropped.