Which road connects the most countries?

Upvote:6

Based on your example European Route 40 goes through 10 countries.

France, Belgium, Germany, Poland, Ukraine, Russia, Kazakhstan, Uzbekistan, Turkmenistan, and Kyrgyzstan.

Upvote:7

The biggest issue is what defines a road, a country and where a road starts or ends.

That being said, there are two likely candidates:

Option 1: The Pan American Highway:

The Northern Pan-American Highway travels through 9 countries:

Canada (unofficial)
United States (interstate system official)
Mexico
Guatemala
El Salvador
Honduras
Nicaragua
Costa Rica
Panama

The Southern Pan-American Highway travels through 8 countries:

Suriname
Guyana
Venezuela
Colombia
Ecuador
Peru
Chile
Argentina

Important spurs also lead into 4 countries:

Bolivia
Brazil
Paraguay
Uruguay

Option 2: AH1 (with the E80 extension):

This travels from Japan through Hong Kong, China, all the way to Turkey, and connects to the E80 to Portugal, connecting over 20 countries. However, connecting over the ocean is interesting, as is joining two roads, and whether or not you count countries like Hong Kong as actual countries.

However, I'm pretty confident with whatever mechanism you use to measure, the outcome will be one of the above two options.

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