Crossing from USA to Canada (or vice versa) by car, without going through a standard border control

I was told (this was very long ago so things may have changed) that the border between USA and Canada has some spots where the border control is non-existent, and that there are some dirt roads between the two countries that go through this type of area.

If this is the case, a person driving on this kind of road could eventually cross to the other country without going through a border control point.

This is about the hypothetical event that a person happens to be sightseeing, let's say in Maine or Montana, and finds themselves in the "other" country. Are there formalities that the person should follow if he wants to stay in the other country? For example, should the person go to the nearest police station and inform the authorities about their whereabouts?

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Crossing from USA to Canada (or vice versa) by car, without going through a standard border control - Splashing Niagara Falls and yacht sailing on river

Crossing from USA to Canada (or vice versa) by car, without going through a standard border control - Men fixing problem in motor of car

Crossing from USA to Canada (or vice versa) by car, without going through a standard border control - Through glass of windshield of ethnic crop male driver in cab while working in city

Can you drive into Canada without going through customs?

Due to the Western Hemisphere Travel Initiative (WHTI) Americans may enter Canada by car without presenting a US passport on arrival, although they are still required to present a form of national ID.

Can you cross from US to Canada right now?

Travel requirements and exemptions. Travellers entering Canada by land, air or water, regardless of citizenship, must meet COVID-19 requirements: Canadians must meet and follow all of the same entry requirements. All travellers must use ArriveCAN within 72 hours before your arrival to Canada.

What is the easiest border to cross into Canada?

Easiest border crossing in the area - Peace Bridge

Canada.
Ontario.
Fort Erie.
Fort Erie - Things to Do.
Peace Bridge.

Can you cross from US to Canada without a passport?

Entry into Canada: Canadian law requires that all persons entering Canada carry proof of citizenship and identity. A valid U.S. passport, passport card, or NEXUS card satisfies these requirements for U.S. citizens. Children under 16 only need proof of U.S. citizenship.

The Places Where Sneaking Over the US-Canada Border is Legal

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Javon Swaby, Ryutaro Tsukata, Tim Samuel, Tim Samuel