An eastern Iowa man was seriously injured during a motorcycle accident Sunday night, in Sac County. According to Sheriff Ken McClure, 55-year old Ricky Zickefoose, of Brighton, was riding a 1985 Honda motorcycle westbound on 280th Street at around 8:30-p.m., when he failed to stop at the posted intersection with Sac County road M-54. Witnesses said he was operating the cycle at highway speeds when he drove off the road at the T-intersection and entered a corn field. Zickefoose was transported to Loring Hospital in Sac City by Sac County Ambulance, and then flown by helicopter to Mercy Medical Center in Sioux City.