First Big Day as Manger: Failed!

I had a meeting out in Rockville. I've been to this place before. I know how long it takes to get there. I did metro trip planner just to be sure. I gave myself an extra 15 minutes just in case something happened. Well Metro politely ate that up and wouldn't even say what was going on. We are just waiting on the platform went from saying "Shady Grove 2" to "Shady Grove __." So I was late to my first meeting as manager. Well by the end everyone had forgot it happened. It was such a good meeting. So next time I will give myself 30 minutes grace period. I'll just sit a little longer in the lobby if need be. Being late is not a good look.