Bicycle Safety - "3 ft to pass" - Coloroda USA

Seems to bring them roughly in line with the law in the UK? No legal requirement to leave 3 feet, it's just recommended.

I know when I was taught to drive I was always told to pass cyclists leaving them 'enough room to fall off'.

Highway code rule 163

"Overtake only when it is safe and legal to do so. You should
....
give motorcyclists, cyclists and horse riders at least as much room as you would when overtaking a car (see Rules 211-215)"

No minimum distance, just guidance. Doesn't matter though, since they can't spot it on camera they don't enforce it anyway.