In the US, there's plenty of places with a speed limit of 80: https://en.wikipedia.org/wiki/Speed_limits_in_the_United_States_by_jurisdiction#/media/File:US_Spe

In the US, there's plenty of places with a speed limit of 80: https://en.wikipedia.org/wiki/Speed_limits_in_the_United_States_by_jurisdiction#/media/File:US_Speed_Limits.svg https://en.wikipedia.org/wiki/Speed_limits_in_the_United_Sta... And many more places with 75 - which people effectively treat as 80.