Question: What impact if any do written traffic warnings have on my record?
Answer: As far as your driving record is concerned, they don’t exist. In my time reading many driving records and speaking to other traffic attorneys, we have never seen them appear on a driving record nor does the Secretary of State (the DMV) record them as offenses which can damage your driving privileges.
That said, they do exist in some form within at the very least the department records. The only purpose I can see is to guide other officers in whether leniency is appropriate in the future. In some counties, it is not uncommon for prosecutors to ask officers if they have previously written warnings for a driver to determine what punishment is appropriate. In general though, these records appear to be stored within each department individually and are unlikely to be shared meaning that in practice, written warnings are more likely to have no effect on a driver in the future.