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Michael
Hi Christian:
I agree with the suggestions that others have made above. In fact, moments ago, I just finished driving the 401 from west of Milton (on the far west side of Toronto) across Toronto to the eastern boundary of the city.
There is truly horrible construction on the 401, both directions, from about Yonge Street (middle of Toronto) to Milton (40 km west of Yonge Street). Lane restrictions, shifting lanes, scarified pavement, narrow lanes, no shoulder... every possible horror is there. So while I do support your proposal to do Montreal to Sarnia (or Montreal to Windsor) and return as your route, I very strongly recommend that on the westbound portion of your trip, you take exit 410 (mileage marker 410) to the new "Highway 412", go north on Highway 412 a short distance to the toll road Highway 407, take the 407 across the top of Toronto until it crosses the 401 at mileage marker 333, then continue on the 401. By doing this you will miss all the Toronto traffic jams and miss all the construction. Then do the same on the way back in the opposite direction.
See the picture below, it illustrates the proposed diversion. The tolls will cost you $43 in each direction, but the reduction in headache, traffic jams, traffic density, and avoidance of all construction will make it worth the $83. That diversion will probably also reduce your travel time by 30 to 45 minutes in each direction. Be aware that there are no Enroute service stations on either the 412 or the 407, so gas up before beginning this diversion.
In Ontario, as long as your speed is 119 km/h or less on the "400" series of highways, no policeman will ever stop you. Best not to go faster than that, though.
Here are two useful links for you:
1) Official Ontario Road Maps (downloadable): click here
2) Highway 407 Toll Calculator & Map: click here
Lastly, my home is quite close to your route, only 5 km away from exit 373. So if you need any assistance along your route, up to & including a motorcycle swap if you are having difficulties, let me know.
Michael
Recommended Diversion (red arrow shows continuation of travel on the 401)

I agree with the suggestions that others have made above. In fact, moments ago, I just finished driving the 401 from west of Milton (on the far west side of Toronto) across Toronto to the eastern boundary of the city.
There is truly horrible construction on the 401, both directions, from about Yonge Street (middle of Toronto) to Milton (40 km west of Yonge Street). Lane restrictions, shifting lanes, scarified pavement, narrow lanes, no shoulder... every possible horror is there. So while I do support your proposal to do Montreal to Sarnia (or Montreal to Windsor) and return as your route, I very strongly recommend that on the westbound portion of your trip, you take exit 410 (mileage marker 410) to the new "Highway 412", go north on Highway 412 a short distance to the toll road Highway 407, take the 407 across the top of Toronto until it crosses the 401 at mileage marker 333, then continue on the 401. By doing this you will miss all the Toronto traffic jams and miss all the construction. Then do the same on the way back in the opposite direction.
See the picture below, it illustrates the proposed diversion. The tolls will cost you $43 in each direction, but the reduction in headache, traffic jams, traffic density, and avoidance of all construction will make it worth the $83. That diversion will probably also reduce your travel time by 30 to 45 minutes in each direction. Be aware that there are no Enroute service stations on either the 412 or the 407, so gas up before beginning this diversion.
In Ontario, as long as your speed is 119 km/h or less on the "400" series of highways, no policeman will ever stop you. Best not to go faster than that, though.
Here are two useful links for you:
1) Official Ontario Road Maps (downloadable): click here
2) Highway 407 Toll Calculator & Map: click here
Lastly, my home is quite close to your route, only 5 km away from exit 373. So if you need any assistance along your route, up to & including a motorcycle swap if you are having difficulties, let me know.
Michael
Recommended Diversion (red arrow shows continuation of travel on the 401)

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