The ability to anticipate means that, ability to think about future something that may happen or ability to look forward for making decisions. This ability will further leads to making future decisions by facing different hazards and conditions.
This ability can be affected adversely if there is some stress on the person. He will not be able to take right decisions and can't look forward. So the statement is true that, ability to anticipate and determine upcoming driving hazards and conditions are adversely affected by stress.
