1. True
Naturally, an accident can be caused by some driver, but that same accident might be prevented or avoided by the other driver.
More information:
An accident can be caused by any driver. It may be due to drivers error or, sometime condition is responsible.
But that same accident might be prevented or avoid by the other driver if he/she is active and ready to respond quickly.
Also, the explanation/discussion among the other drivers about the factors can also reduce the possibility of accident.