In recent years there has been a significant increase in the volume of hay traded in Australia, which has seen an increase in the public awareness of accidents involving hay truck rollovers or hay falling from trucks. As a consequence, enforcement officers have selectively focused load restraint and dimensional infringement notices on the hay transport sector, highlighting the inequity in the regulatory system that has different rules in each State. A significant study into the stability of hay trucks was completed for RIRDC in October 2003 (RIRDC publication 03/120). This report expands on the work carried out in the original study by incorporating physical testing of fore-aft load stability and some additional Performance-Based Standards assessment by computer simulation. 2004, 36pp, Pub No 04/124; $21