How long can I leave i can't see the road when i back out before it becomes dangerous?
There is no sudden failure here — the hazard is a collision, not a falling tree, and it is present every single time someone backs out. Left alone, the band you need cleared thickens each season, and the eventual pruning gets larger and more disfiguring than an early one would have been. The predictable pattern is worst from full leaf-out through fall and clear enough in winter that the problem gets forgotten until the following summer. If the corner is genuinely blind, treat it as a this-month job rather than a someday one.
Whether it can still be saved
Nearly always. Crown raising — removing the lowest limbs and shortening others to lift the canopy clear of the sight band — resolves most driveway sightlines in a single visit, and a healthy tree tolerates it well provided the work stays inside limits: keep the live crown to a clear majority of the tree's total height, avoid removing more than roughly a quarter of the living canopy in one season, and cut back to the branch collar rather than leaving stubs. Topping is the wrong tool and makes the sightline worse within a few years, because topping cuts provoke dense clusters of weakly attached sprouts precisely where you just cleared. Removal is the right answer only when the trunk itself, rather than the branches, stands in the line of sight.
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