One night I was very stressed out and around midnight I decided to go home from office as I wanted to get some rest. But as I began to drive home I began to think that I am so stressed out with my mind barely function i.e. I can make poor judgement and I am driving - is that right? It made me realized that stress can greatly impact my judgement call and hence I am greater risk on road. But hey, look at the driver manual -  http://www.nydmv.state.ny.us/dmanual/chapter08-manual.htm#drw-drv - it doesn't even have a single word that how driving can impact if you are under stress or tension.

The manual discuss fatigue but stress doesn't explain that. The meaning of fatigue is:

Something, such as tiring effort or activity, that causes weariness: the fatigue of a long hike.
Physiology. The decreased capacity or complete inability of an organism, an organ, or a part to function normally because of excessive stimulation or prolonged exertion.

Don't you think we need to have more description about what can impact driving? Hence the  DMVs need to do a better job of educating people...my two cents.