be caught up in a traffic jam
get stuck in a traffic jam
VIP=very important person
expect a visit/call from sb
We were expecting him yesterday.
Are you expecting visitors?
A: Sorry to be late, I was caught up in a traffic jam. Am I the last guest to arrive?
B: Yes, VIPs always are. It's quite all right. You're a very important person at this party.
A: Oh, please don't.
B: I was just kidding. We've been expecting you the whole time.