Ontario will try to keep border traffic moving

Both the U.S. and Canada governments fear that truck traffic across bridges could slow to a trickle if the U.S. national terrorism alert is raised to code red, the highest level on the scale.

"The Ontario government has made security a top priority with a special emphasis on keeping the critically important Canada-U.S. border crossings as open and free flowing as possible", says Runciman.

Security on the Canadian side of the border was also increased Wednesday, as the province declared a "Level-2" alert.