A 65-year-old Ventura man was arrested Monday for driving under the influence and overturning his car near Highway 101. The incident began around 3:25 p.m. yesterday when a California Highway Patrol officer saw Gary Ulam weaving through traffic and almost causing an accident on Highway 101 north of the Clark Avenue exit. CHP officers caught up with Ulam near the Main Street exit. Ulam went to the right and hit a guardrail, causing his car to fall down an embankment and flip onto the driver's side. Ulam suffered moderate injuries and was sent to Marian Region Medical Center. Ulam was arrested after an investigation showed that he was intoxicated.