For some people, driving seems to be a safe act, as far as it is done moderately. Hence, it can be said that, having a few glasses is still okay, provided it is done in a secure place, and at a time when you have no other duty to perform. This is due to the fact that starting with few glasses, could lead to downing quite a number of bottles.
For someone who drinks and drive, there are lots of adverse effects which could take place. First off, the individual would be subjected to poor decision making skills. One fact about alcohol is, it adversely affects your judgement, and your depth perception too. The necessary motor skills which are needed to drive well, would be affected as well.
The individual might think he is driving well under the influence of alcohol. However, it could be that he is driving roughly, at the expense of his life, and anyone who is on the road, as lives could be lost. There have been various studies on the causes of motor accidents, and a good percentage of the causes has been attributed to the fact that those behind the wheel were intoxicated.
Hence, it is essential that whoever is driving, needs to have a sane mind, so that he would not endanger his life, and those around him. Someone who is driving and under the influence of substances, might not remember the fact that he has friends and family who care about him.
In cases when you get stopped on the road for driving rough, and the officer stops you in order to find out what is wrong, you could be in for some serious trouble, because driving under the influence of alcohol is punishable by law in most countries.
In some cases, you might be asked to show the necessary motor skills, or probably operate a vehicle during a field test. If you fail at doing this, you would face the legal punishments of drinking and driving.