The dalton is a low risk road spread along a great distance. For real terror, a few dangerous miles of road require an Army to navigate safely.

https://en.wikipedia.org/wiki/Rogers_Pass_(British_Columbia)

>> to keep the highway and railway open during the winter, the Royal Canadian Artillery has since used 105-millimetre (4.1 in) howitzers to knock down unstable snow under controlled circumstances to reduce avalanche hazards. Stopping is prohibited in high-risk locations.