Accident on 421 in Zionsville 0 By Current Publishing on November 5, 2014 Zionsville, Zionsville Community Zionsville police are warning all vehicles going northbound on Michigan road to drive with caution as there is a overturned vehicle, part of an accident with injury. Traffic is backing up in both directions. This story will be updated. More Headlines Share. Twitter Facebook Pinterest LinkedIn Tumblr Email