In this scenario, safety is the top priority. The best course of action would be to stay on your side of the highway and try to slow down. You should honk your horn to warn the other vehicles of your presence and the impending hazard. This choice minimizes the risk of a head-on collision with oncoming traffic and avoids swerving into potentially dangerous situations.
It's important not to steer into oncoming traffic or attempt to swerve across lanes, as this could lead to a more severe accident. If you can safely press the right side of your vehicle against the guard rail to help slow down without hitting the guard rail, that could also be a consideration, as long as you can do so safely and without causing further issues.
Always prioritize caution in situations like this to protect yourself and others on the road.