The 401 is widely considered to be North America's busiest highway, with an estimated Annual Average Daily Traffic (AADT) of over 425,000 in 2004, near the interchange with Highway 400. Due to its triple use as the main trade, commuting and recreational corridor in Ontario, the AADT rises to well beyond the 500,000 level on some days. The highway has 12-20 lanes through Pickering to Mississauga and this is thought to be the world's longest continuous stretch of highway having 12 or more lanes. The main reason the highway is so large is the fact that Toronto has very few highways so the ones it does have particularly the 401 tend to be quite large, another highway(the 400) is similar in size to the 401 but not for the same distance.








This is highway 400, similar to the 401

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