That 90% is within 100 miles of the border, not 20km. And keep in mind that border is one of the longest on the planet. Not that it’s a good reason to have cars (it takes days to drive between Toronto and Vancouver, I think a train would be a much better experience for something more efficient than a flight).
not necessarily infinite, length is quantized so when you get to planck length sized chunks you can declare a largest border length (at least, the planck length is the shortest distance we can measure)
That 90% is within 100 miles of the border, not 20km. And keep in mind that border is one of the longest on the planet. Not that it’s a good reason to have cars (it takes days to drive between Toronto and Vancouver, I think a train would be a much better experience for something more efficient than a flight).
Depending on how you count it can have infinite length
not necessarily infinite, length is quantized so when you get to planck length sized chunks you can declare a largest border length (at least, the planck length is the shortest distance we can measure)
Thanks! wasnt sure about how close to the border will fix.
And because you mentioned the length of the border, ill also add another tidbit in the edit