As of 7/28/20, travelers from 36 states and two territories who are arriving in New Jersey are asked to self-quarantine and/or get a COVID-19 test. The list includes frequently visited states like Maryland, Delaware and the District of Columbia. People arriving in New Jersey from a state with a COVID-19 positive test rate higher than 10 infected people per 100,000 residents, or a state with a 10-percent-or-higher positivity rate over a seven-day rolling average, are asked to self-quarantine for 14 days or get a COVID-19 test when they arrive, and self-quarantine until they get the results. The travel advisory does not apply to people briefly passing through states on the list (stopping at highway rest stops; layovers for air, bus, or train travel). Complete information available here.