Before you leave for your job interview, make sure that you have the correct address and directions to the location. If possible, do a test run of the journey to the interview and familiarise yourself with the campus/building.
This will make the day of the interview run much more smoothly and also help you relax with some degree of familiarity.
It’s also important to have a phone number for your contact at the company, just in case you are running late for reasons outside of your control.