Additional information is expected to be released later this morning with regard to a single-vehicle accident that happened near Walnut, Monday evening. According to the Pottawattamie County Sheriff’s Office, the male driver of the vehicle was transported by Walnut Rescue to the Cass County Memorial Hospital, after the van they were in left a curve on Highway 83 at a high rate of speed, south of Walnut. The van entered a ditch and impacted an embankment on the east side of County Road M-47, before coming to rest.