How can you determine if you're fit to drive after using substances?

Determining your fitness to drive after using substances requires careful consideration of your mental and physical state. The best approach is to recognize that if there's any uncertainty about your level of impairment, it's safest not to drive. This is because substances can have unpredictable effects, varying by individual tolerance, type of substance, and amount consumed. If you are unsure, waiting for the effects to wear off eliminates the risk of endangering yourself or others on the road.

The other options suggest alternatives that may not adequately ensure safety. Driving slowly to test your reactions could lead to overconfidence and does not truly evaluate your ability to respond to traffic situations. Relying on a friend's opinion may not provide an accurate assessment of your impairment, as they might not fully understand the effects of the substances you have consumed. Monitoring your body for signs of sobriety can be misleading, as symptoms of impairment can persist even when you think you feel better. Prioritizing safety by opting to wait when in doubt is the most responsible choice.