Now i know you and
@5n0man are having light hearted dialogue, and believe me I am cracking up in the background just reading the back and forth between yall.
But im pretty sure you can engineer a structure capable of surviving a landslide. Now take this with a grain of salt because i only ever took one cad course in college and the coursework of the civil engineers and mechanical engineers in the class scared me at the time. Their physics was on another level brehs
With that disclaimer being said, I'm pretty sure you could make a structure that can support itself independently of the hill that's prone to landslides by preemptively digging into the hill and fastening a foundation of steel and concrete under the hill and having a leg of the bridge grow upward from it. This would all be supported by the same tunneling equipment used by subways to prevent them from collapsing in earth quake prone cities like Tokyo, except it would be vertical instead of horizontal.
Again, as a computer guy I don't know how feasible this would be ; but after getting that foundation built you could be even more thorough by having connecting support beams to the free-standing pillars of the bridge. You should be able to calculate the exact amount of force of a potential landslide and the specific gravity of moist soil through cad software based on the composition of the Hill, and then select the thickness/material of the pillar accordingly.