Do you ever wonder why our stoplights designate red as stop and green as go? Me too! In fact, it was my daughter’s question on this very matter that inspired me to do some historic research. In the 1840s the British railroads adopted a flag, lamp and semaphore signal system where red meant danger, white meant safety and green indicated proceed with caution. They took their inspiration from early industrialization where factory machines used red to indicate the equipment was off and green when turned on.