The cost of travelling from Windsor to Detroit via the Detroit-Windsor Tunnel has gone up 25 cents to $4 US.

The increase is meant to "equalize the difference" between the Canadian and American exchange rates, according to Mark Galvin, executive director of the Windsor Tunnel Commission, which oversees operations on the Windsor side.


Cars line up at the Windsor entrance to the Detroit-Windsor Tunnel, where the toll in U.S. currency will rise to $4. ((Tom Addison/CBC))

"We have a fair exchange policy, and right now the difference between the two rates is a little too wide," he said.

The increase will go into effect at 12:01 a.m. ET on Wednesday.

The rate in Canadian currency, at $4.50, will stay the same.

The Detroit-Windsor Tunnel links the downtowns of both cities and handles about 28,000 vehicles daily.

It is the only "vehicular international sub-aqueous border crossing in the world," according to the website of the Michigan Department of Transportation.