What type of interchange, that is widely used in North America and in some pArts of Europe, did the Ontario Ministry of Transportation invent?

More Questions:

What is the name of the calendar we use today?

Whose still-life painting, "Rideau Cruchon et Compotier', sold for $60.5 million in 1999?

What year saw the release of the first Harry Potter book?

What literary character comes from Villa Villekulla in Sweden?

Who wrote "Allegory of the Cave"?

Which writers works include "The Dark Eyes of London', "Four Just Men" and "Sanders of the River"?

What war is the Tribe fighting against conscription into in the musical "Hair"?

How many chromosomes are in human DNA?

How many chromosomes does a horse have?

Whose "Analyst" was James Coburn in a 1967 film?

What disability does Dustin Hoffman's character have in the movie "Rain Man"?

Who played the role of Andy Dufresne in the movie "The Shawshank Redemption"?

How long did New York City's first subway system take to build?

How many Americans from the US Embassy in Iran were taken hostage in November, 1979?

In which field did Wayne Sleep achieve fame?