How was the first electric signal created by James Hoge in 1914 controlled?

Answer

Manually switched by a nearby police officer

Although electric, Hoge’s 1914 system was not fully automatic; it relied on a police officer stationed nearby to manually switch the indications from one indication to the next.

How was the first electric signal created by James Hoge in 1914 controlled?
inventorTransportationSignalautomationtraffic light