Substance use
In case you are addressed the following question: “Have you consumed any alcohol or drugs prior to or while you were driving?”, just know you are not required by the law to deny or confirm anything. Again, using a polite form to not answer the question is your right and cannot be held against you.
However, we do advise that you stay away from driving under influence of any kid, be it alcohol or other substances, as it can be extremely dangerous for you as well as for other fellow drivers.
What you are doing
You have the right to remain silent if the police is asking you “What are you doing?”. To let the police offer know that you also know your rights, you may want to say “I choose to remain silent.” This way, you are not ignoring their question, simply choose not to answer it, as per the Constitution.
On the other hand, in some states, not informing the police what your name is, should they ask such a question, could end up with you behind bars. So, provide your name, but remember, you are not obligated to provide any other type of information.
See also: 8 Shocking Signs Your Phone Might Be Hacked