A fatal accident yesterday in North Monterey County caused both lanes of Highway-129, between Rogge Lane and Chittenden Road, to shut down for several hours. The 3:30 p.m. crash occurred near the town of Aromas, when a Watsonville man, who was driving a loaded cement mixer with a trailer West near Rogge Lane, veered across the eastbound lane, causing the truck to roll over and hit a tree. The driver was declared dead at the scene. The road was reopened after 10 p.m.