I love so many things about Disney history, but not this 🤦‍♀️ The center rail was added later when people were spinning out and ramming each other so much it became a safety issue, despite the 25mph police cars policing the track. The whole purpose of Autopia was to teach kids how to be responsible drivers with so many freeways being built at the time. It was also at that time that Disney got 160 newly-designed Mark VI cars without the wraparound aluminum frame since they were no longer necessa