The 20th of April (also known as 4/20 — a date associated with marijuana use) many marijuana users will observe a day of increased marijuana use. NHTSA wants to remind all drivers: If You Feel Different, You Drive Different. It is dangerous and illegal to drive impaired.
If you are planning to use drugs, plan ahead for a sober driver to safely drive you to your destination. Like drunk driving, it is essential that drug-impaired drivers refrain from driving a vehicle. It is never okay to drive while impaired by any substance — regardless of whether it was legally obtained