If you want smooth sailing whether in driving to work or to your dentist, taking a flight or attending a seminar, then start early.
Planning the night before what you need to take with you, the clothes you want to wear, thinking about the potential traffic at the time of your travel, will greatly enhance your journey. You will be relaxed and actually enjoy the ride.
It is a myth to think that by squeezing in every minute and starting late that you are saving time. Actually, you are saving time by starting early because you will be better prepared for the meeting and save time avoiding the traffic.
Being early is the mark of successful people.