Why did the man receive a ticket?

W: I don’t understand how you got a ticket. I always thought you drive carefully.
M: I usually am, but I could make it before the light changed.

M: We’ll be here in London staying in a newspaper office or teaching in a classroom full of chalk dust.
W: Well, Tom, you’d be able to go out in the sunshine sometimes. You are a journalist. I am the one who has to stay in the classroom. Remember.