Section 321.815

[1971 c.654 §4; 1977 c.884 §24; 1981 c.804 §94; 1983 c.462 §9; 1983 c.657 §1; 1991 c.459 §315; 1993 c.801 §35a; 1997 c.541 §§408,408a; 1999 c.314 §93; 1999 c.1078 §76; 2003 c.621 §59; renumbered 321.839 in 2003]