DMV driving handbooks are available online at the DMV.org website or in-person at a local DMV office for the driver's state. DMV.org allows the user to pick a state and provides links to that state's standard driver's license handbook.
Other resources available through DMV.org include links to commercial driver's license and motorcycle license handbooks for most states. The site also has information on each state's vehicle code.
Each state's driver license manual contains information on rules of the road, license applications, safety tips, non-resident rules and DUI laws. Commercial driver's license manuals contain information on towing trailers, combo vehicles, pre-trip inspections and how to obtain a CDL through the state.