RONALD (WKZO) -- Accident investigators in Ionia County suspect that thick fog may have been responsible for a fatal wreck on the curve in Ronald Township where Van Vleck Road turns into Allen Road.  They suspect that 35-year-old Jason Scott Shriner of Greenville simply couldn't see where he was going just before 9 a.m. Sunday when his vehicle left the road at a curve, striking a tree.  He is believed to have died on impact.