traffic light
On December 9
The first traffic lights are installed, outside the Palace of Westminster in London. Resembling railway signals, they use Railway semaphore signal|semaphore arms and are illuminated at night by red and green gas lamps.
The first traffic lights are installed, outside the Palace of Westminster in London. Resembling railway signals, they use Railway semaphore signal|semaphore arms and are illuminated at night by red and green gas lamps.