The study used eye tracking equipment to analyze where subjects were looking and how long it took them to focus on a new object. Some subjects were also asked true or false questions at the same time in order to simulate a simple conversation. Data collected from the study found that subjects who answered questions took twice as long to focus on a new object than those who were asked no questions.
Although engaging in conversation seems simple, it involves a number of complex tasks that the brain must handle simultaneously. Even if the topic of conversation is straightforward, the brain has to absorb information, overlay what a person already knows and prepare to a construct a reply. And, although this process is done extremely quickly, it can also slow down reaction times and lead to a dangerous accident on the road.
The best way to keep your employees safe while driving is to encourage them to eliminate or turn off all potential distractions, including their cellphones and any hands-free accessories they may use to make a call. You can also consider including language about safe driving practices in your workplace safety policies.