Generally speaking, if an approaching vehicle is drifting into your lane, you should:

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If an approaching vehicle drifts into your lane, your first response should be to steer toward your right side. The natural reaction of a driver who has drifted into approaching traffic lanes is to steer back into their lane. If you steer into their lane, you risk a head-on collision. Honking and flashing lights may be useful tools if there is time, but do not rely on them to be your best means of avoiding a crash. Downshifting and slowing are also useful tools but may not be enough to avoid contact. Be ready to move to your right side if another driver is heading toward your vehicle.

Generally Speaking, If an Approaching Vehicle Is Drifting into Your