Ah, the quintessential question about the color of fire trucks! The story behind fire trucks being red may not be as exciting as answering 'Why is the sky blue?' but it's significant nonetheless. Early fire brigades in the 19th century wanted their wagon to stand out, and red was a logical choice. It's a vibrant color that's noticeable even in low light, which was crucial in the days before modern road lighting.
Fire departments wanted to ensure that their wagons could be easily seen and give clear warnings to bystanders and other vehicles. Convention eventually made red the standard for fire engines in the early 20th century.