This is Gretna Green. Once there was a toll ... but now, the border is marked by those flowers on the right. I believe this type of crossing is called "frictionless".
Shouldn't laugh, I know - but what do we imagine the consequence will be of the scotties hiking the price of three litres of antifreeze industrial-strength cider from £3.59 to £11.25? There's quite a few quid's worth of cross-border abritrage in that spread.
You could call it a dry run for for the post-Brexit Irish. (Dry run ... geddit?)