For Americans wanting to get into Canada quickly, the Derby Line/Stanstead crossing is ideal. The wait at the border is much less than that at the major border station down by the highway. Having said that, don't be fooled by the absence of physical barriers running through the border. In fact, one street has some houses on the American side (Derby Line, VT) and the rest on the Canadian side (Stanstead). Don't cross the street to get to the other country; you need to to report to border agents before going to the other country.