IOWA CITY — A relatively low portion of accidents between farm equipment and passenger vehicles involve alcohol. But those that do tend to be more dangerous and deadly, according to a new study out of the University of Iowa.Karisa Harland, UI adjunct assistant professor of emergency medicine, led the National Institute for Occupational Safety and Health-funded research from the UI’s Great Plains Center for Agriculture Health.She said the hope for the study — published this month in “Traffic Injury Prevention,” a bimonthly peer-reviewed journal — is to educate motorists and farmers and encourage preventive practices.“From a farmer perspective, they need to make sure that their equipment is well lit,” Harland said.She added making equipment such as tractors and combines more visible could be as simple as “cleaning off your slow-moving vehicle sign so it’s more reflective and replacing it if it’s starting to fade.”“From a motor vehicle and passenger vehicle standpoint — obviously there needs to be continued education on the risks of driving while impaired,” she said.