When drivers, motorcyclists, bicyclists, and pedestrians share the road, the one who is responsible for avoiding crashes is?

In order to avoid crashes the one who is responsible when drivers, motorcyclists, bicyclists and pedestrians share the road is apparently the driver. It is the responsibility of the driver to exercise complete control over movements on the road. They are responsible to avoid crashes since they have the complete control over the vehicle or does not have a full view of the roadway and the traffic ahead of such vehicle.

I believe the answer is: validators

In psychological term, validators refers to the individuals who give a certain acknowledgment and acceptance toward the behavior or emotions that displayed by another individuals.
If validators involved in a certain conflict, all parties involved is much more likely to achieve a certain common ground/compromise compared to conflict without any validators