He injured his leg in a traffic accident.

I happened to meet him at the street corner.

He was unfortunate enough to be involved in a traffic accident.

I visited my friend in the hospital to ask after his health.

Unfortunately, he was late for the train.

Unfortunately, he dropped his wallet.

He didn't think an incident would occur to him.

He was in a traffic accident yesterday.

I travel along this route every day.

I live in a place with good transportation.