By how much are crash chances increased if a driver has been drinking?

The answer indicates that crash chances are significantly increased, with a sevenfold increase in risk for drivers who have been drinking. This reflects the well-researched understanding that alcohol impairs cognitive functions such as decision-making, coordination, and reaction times, which are crucial for safe driving.

In numerous studies, it has been shown that as a driver's blood alcohol concentration (BAC) rises, their likelihood of being involved in a crash increases dramatically. A seven times greater risk suggests a serious concern for public safety and underscores the importance of driving sober.

The other options suggest greater or lesser increases, which do not align with established research on the effects of alcohol on driving ability. Understanding this statistic reinforces the critical message of responsibility when it comes to alcohol consumption and operating a vehicle.