Common sense is often right but also often wrong, and I wouldn't expect it to do a good job at working out the nuance of whether you drive enough slower to coun

Common sense is often right but also often wrong, and I wouldn't expect it to do a good job at working out the nuance of whether you drive enough slower to counteract negative effects such as reduced reaction time, or other drivers expecting you to be driving differently (faster, for example, but also in more subtle ways.). And this particular common sense doesn't do anything to inform you as to overall driving patterns because it doesn't say anything about the percentage of people driving high, or about whether a significant number of drunk drivers are now stoned drivers, etc.