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CALGARY - Canadian researchers know why the salamander crossed the road, and now they hope to fix things so it won't have to.

The federal parks agency plans to install tunnels under a highway at a cost of about C$40,000 ($53,670) to end years of carnage among the long-toed salamander of Waterton Lakes National Park in southern Alberta.

The project is aimed at diverting the 13cm-long amphibians under the pavement during their nocturnal journeys between a mountainside and a lake where they breed.

The population in the area is pegged in the hundreds or low thousands, and mortality rates due to being squashed by cars and trucks have been estimated at 10 to 40 per cent, said Cyndi Smith, a Parks Canada conservation biologist.

They only make the roughly 800m trek at night when it rains, making them nearly impossible to see from behind the wheel.

"It would be one thing if we didn't know this was happening, but we know this mortality is happening. It's right here in front of us," Smith said.

"They're not grizzly bears or big elk or anything like that, but they're still a species that's important to the ecosystem."

It is the latest attempt to help the salamanders on their migration, which occurs a few times each year. They are considered a sensitive species in Alberta.

In the early 1990s, before park staff knocked down a curb the animals were unable to scale, local volunteers lifted about 1200 of them over the bump through two rainy April nights.

Four tunnels, each about 12 metres long, will be spaced along a 600-metre stretch of road. Construction is set to start in October.

- Reuters