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This area is not as flat but the highway is generally straight.This part of Highway 401 often experiences heavy snowsqualls in early winter, sometimes extending as far east as Toronto.In addition, Highway 401 was equipped with a traffic camera system called COMPASS in early 1991.Using closed-circuit television cameras, vehicle detection loops and LED changeable-message signs, COMPASS enables the MTO Traffic Operations Centre to obtain a real-time assessment of traffic conditions and alert drivers of collisions, congestion and construction.The speed limit is 100 km/h (62 mph) throughout its length, with the only exceptions being the posted 80 km/h (50 mph) limit westbound in Windsor and in most construction zones.By the end of 1952, three individual highways were numbered "Highway 401": the partially completed Toronto Bypass between Weston Road and Highway 11 (Yonge Street); Highway 2A between West Hill and Newcastle; and the Scenic Highway between Gananoque and Brockville, now known as the Thousand Islands Parkway.
It stretches 828.0 kilometres (514.5 mi) from Windsor in the west to the Ontario–Quebec border in the east.
An 8-kilometre (5 mi) section of the parkway, east of the E. Row interchange, opened on June 28, 2015, with the remaining section completed and opened on November 21.
Elsewhere in Ontario, plans are under way to widen the remaining four-lane sections between Windsor and London to six lanes and to widen the route between Kitchener and Milton as well as through Oshawa.
To avoid confusion between carriageways, blue signs are used for the collector lanes and green signs for the express lanes.
Unlike the collector lanes, which provide access to every interchange, the express lanes only provide direct access to a select few interchanges.