That is called IN land Landing, many who are in Canada and get the permanent residence papers in Canada, they have go to any Canada immigration border post and inform them you want to land, they will tell you to go toward US and make a U turn, normally you don’t go up to US INS even before that you can make a U turn, if any border post has no U turn you can walk towards US just for 2 meters and come back to Canada immigration, Niagara Buffalo Rainbow bridge is the best, you walk few meters US side ( no need to cross US immigration) and then turn back to Canada immigration, you can park your car in Canada side, if one wants to land by any other border post they have U turn