Final answer:
The three risk drivers related to drowsy driving are fatigue, speeding, and texting while driving. Fatigue is the most relevant factor as it directly causes impaired driving abilities similar to alcohol intoxication, which can be dangerous on the road. Experimental studies with random assignments help measure the impacts of sleep deprivation on driving performance.
Step-by-step explanation:
The three risk drivers who may be guilty of drowsy driving include speeding, texting while driving, and driving under the influence of alcohol or drugs. However, among these, fatigue is the primary risk factor directly related to drowsy driving. Fatigue can greatly impair a driver's reflexes, decision-making abilities, and overall cognitive function. Studies have demonstrated that sleep deprivation can have similar effects on the body and mind as being intoxicated, which means that driving while fatigued can be as dangerous as driving under the influence of alcohol. Drowsy driving can lead to slower reaction times, reduced vigilance, and impairment in information processing.
In terms of experimentation, when designing a study to measure the effects of sleep deprivation on driving, it is important to adopt an experimental design with randomly assigned treatments to avoid selection biases. For instance, professional drivers could be assessed after normal sleep and after extended periods without sleep, with their performance in driving simulations being the key measure of their ability to drive safely. Such an experimental design helps in establishing a cause-and-effect relationship between sleep deprivation and driving performance.