On a very popular road hobby facebook group, a member shared links to some great historical videos of various Virginia Interstate Highway ribbon cuttings during the 1960s. A few include North Carolina where both states opened Interstate's 85 and 95 at the same time.
...and here's why. You will find White, Red, Yellow and Violet colored fire hydrants pretty much everywhere. But there's a reason for this - and it's because of the National Fire Protection Association (NFPA). This association has issued guidelines for color coding standards for fire hydrants. These color codes from the body of the hydrant, top of the hydrant, and in some municipalities the outlet caps are designed to allow fire fighters to know what type of system, water flow rate (Gallons Per Minute or GPM), and level of water pressure. This guideline is known as NFPA 291 and is intended to be used universally throughout the United States. The NFPA guidelines are specific to the body and the top cap of the hydrant. If a hydrant is WHITE or YELLOW - it means that it is connected to a public/municipal water system. If a hydrant is RED - the hydrant is connected to a private system, typically a well. These are most common in rural or unincorporated areas