Original: This is to better allay car traffic in the highly scenic Kandertal, and also to provide faster transport through the Bernese Alps from the populous Mittelland in the north to the southern canton of Valais.
Simplified: This is to better spread car traffic in the highly scenic Kandertal, and also to provide faster transport through the Bernese Alps from the populous Mittelland in the north to the southern canton of Valais.