If you live in Iceland and wish to travel to Estonia or Bulgaria, or Malta, you can now take a short plane ride and rent a car or take a train and in a couple of days you will arrive at your desired destination without having crossed a single controlled border. But if you get in your car in Vancouver and drive 45 minutes south to Point Roberts, Washington, you will reach a border control very reminiscent of the old European borders between the Soviet-bloc nations and western Europe, but with enough sophisticated and expensive electronic detection equipment to convince even the most sophisticated terrorist to try another route.
if you are lucky and hit this border at a time when there is not a hour-long lineup (or more) and then manage to pass muster at the guard station, by displaying a valid passport and a believable story about why you want to go to Point Roberts (usually to go to the post office as the US postal system is much cheaper and more reliable than the Canadian one), and then drive another 15 minutes in any direction, you will hit salt water since Point Roberts is US territory accessible by land only through Canada. Kids who live there have to be bussed out to US schools in the main part of the US by passing across this border, making the misery of school bus journeys four times as trying as it is for any other US kids, since they now must cross heavily guarded borders 4 times a day.
OK this is the most absurd of all the East German-like US border crossings, but it is not at all funny at places like the Peace Arch Crossing between Seattle and Vancouver, the highway between Winnipeg and Minneapolis, the tunnel between Detroit and Windsor or the bridge at Niagara Falls. In these places, and in many lesser ones all along what used to be an unguarded border, normal travel regularly comes to a complete standstill as cars wait for hours in lineups that, among other things, make any talk about an interest in cutting down pollution from idling cars ridiculous. Does anyone out there know of a single terrorist who has been captured at a Canada/US border crossing?