Every day, ordinary men and women, climb into the driver’s seat of machines capable of high speeds where a collision with each other, an obstacle, or a living thing, can cause serious injury or death. These people, when they start their engines, could be feeling calm, stressed, angry, sad, or confused. The extent of these feelings may or may not be sufficient to impair their ability to drive safely to their destination. Even if their feelings are sufficient to affect their driving, most times they will be lucky enough not to encounter any problem and will live to drive another day. The same applies to the extent to which they may be under the influence of alcohol or drugs. The viability of our cities, commerce, societies, relies on the trust that people behind the steering wheels of motor vehicles will behave themselves, will not endanger others, and they that they will not use the full potential of the engines they control.