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Drivers Education Key Terms and Definitions Absolute speed limit-the max or min posted speed at which one may drive under normal conditions in good weather. Actual physical control- (will be on the test) a person can be charged with driving under the influence (DUI) of alcohol or some other drug if they have the ability to move their vehicle. Advisory speed limit-a speed limit that advises drivers than an adjusted speed is necessary for a short period of time. Blood alcohol concentration (BAC)-(will be on the test)the percentage of alcohol found in a person’s blood at any given time. In addition, BAC is how law enforcement measures the level of intoxication in a person. Note; levels vary from state to state, in Alabama the legal level is .08% for an adult. Carbon monoxide-a highly poisonous gas that is given off by burning fossil fuel. It is colorless and odorless. Note; many Driving under the influence (DUI)-driving under the influence of any mind altering drug. This includes alcohol, prescription and non-prescription drug, marijuana, hallucinogenic drugs, and any other drugs that alter the brain. Note; in Alabama you can be arrested and taken to jail for a BAC of .05% even when the legal limit for adults (21) is .08%. Hand position-refers to hand placement on the steering wheel while driving. Hydroplaning-a condition in which the tires of a moving vehicle ride on a cushion of water causing loss of control in both steering and braking. Implied consent-(will be on the test) the law stating that any licensed driver cannot legally refuse to be tested for alcohol or drug use while behind the wheel or in “actual physical control” of the vehicle. Over-driving-your-headlights-driving so SIPDE-(on the test) the basic principles of defensive diving. The letters stand for: ON TEST: TELL ME WHAT EACH OF THESE LETTER STAND FOR AND EXPLAIN: S….SEARCH OR SCAN…I…IDENDIFY…P…PREDICT…D…DE CIDE…E…EXECUTE. Space margin-a cushion of space a driver tries to maintain around their vehicle. Space margin distance increases as speed goes up. Note: a safe following *****Total stopping distance- (will be on the test) the distance to bring a vehicle to a complete stop from the time of perception until the wheels actually stop rolling. Note: at 60 mph a vehicle equipped with good tires and brakes travels almost 300 feet from the time you see the conflict until you actually bring your vehicle to a stop. It brakes down like this: perception distance-about 70 feet, response OR REACTION distance about 70 feet, TOTAL braking distance- about 155 TWO SECOND FOLLOWING DISTANCEKEEPING at least two full seconds behind the vehicle in front on you in your lane. Tracking-steering; keeping your vehicle steadily and smoothly on a desired course.