deup said "never said it doesn't apply to me. since towns like russel can cross the boarder since they are a boarder town, and the rules dont apply to them. i simply asked if you make no contact with anyone while across for a few hours does it warrent being isolated "
I think it will depend on what you do. If you just cross the border, drive around a bit, never leave your vehicle or go through a drive-thru etc, and come back, that I don't see the issue.
If you get out, touch o:bjects, get gas, etc. Then yes, I think you would need to self-isolate as you have engaged in activities that could potential infect you.