Be sure to give yourself plenty of time to get to the interview. Plan to arrive at the interview site 15-20 minutes early, and enter the building 5-10 minutes early. It is always better to be early than late. If need be, take some time to drive to the interview location ahead of time so you know exactly where you are going and how long it will take to get there.
When you look at the clock and realize that there is a high chance that you are going to be late, call the office and let them know that you are going to be late. Give a timeframe for your arrival.
In this scenario, be sure to give yourself ample time to make the deadline you set for yourself. This gives everyone a heads up to rearrange schedules and inform interviewers. Be sure to apologize to whomever you are making wait.
We all understand that life happens and there are situations where we aren’t in control. A good candidate is one with good communication skills and an understanding for others’ time.