State workers have caused more than $2 million in damage to state-owned vehicles involved in accidents over the past three years. The state’s 3,600 taxpayer-bought vehicles — which does not include state police cruisers — have been involved in more than 1,100 crashes, causing a total of $2.1 million in damage, $810,000 of which has been billed directly to taxpayers. At least 14 state workers were in multiple crashes. The Boston Herald reviewed accidents involving state vehicles after Lt. Gov. Timothy Murray was involved in a wreck last November that totaled his state car.