(Columbus, OH)--The speed limit on I-70 in one area county could go up to 75 miles per hour.  There’s legislation working its way through the Ohio Senate that would raise the speed limit on I-70 in Preble County to 75.  "I think most people drive 75 anyway," said one Preble County driver with an argument many people make.  The 75 mile-an-hour limit would apply to all rural Ohio interstates.  The bill still must pass the full Senate.