55 mph Speed Limit Day is observed in the USA every January 2. This unofficial holiday commemorates the controversial Emergency Highway Energy Conservation Act signed by President Richard Nixon in 1974, which established a national speed limit of 55 mph in response to the oil crisis. The day serves as a reminder of the importance of road traffic safety and energy conservation. Although the law was unpopular and compliance was low, it aimed to reduce gasoline consumption and the environmental impact of vehicles. People celebrate this day by reflecting on road safety, educating children about safe driving, and even paying off outstanding speeding tickets. Additionally, some may look up speed limits in different countries for fun or share information about the holiday on social media.