FILE - In this Oct. 4, 2015 file photo, a car is submerged in floodwaters in Florence, S.C., after steady rain left many roads impassable, while flooding continues in many parts of the state. Despite public service announcements, signs at hundreds of low-water crossings around the country, electronic billboards and constant reminders from elected officials and travel experts, dozens of Americans die each hear when their cars, trucks, vans and SUVs venture onto flooded roads. Exasperated authorities aren't sure what else they can do to convince people to stay off flooded roads.(AP Photo/Gerry Broome)