Although there are varying opinions on the matter, most people would say that yes, semi trucks do have cameras inside. This is for a number of reasons, the most obvious being safety. Having a camera inside the cab of a semi truck can help to prevent accidents and injuries by providing a clear view of what is happening inside the vehicle at all times. Additionally, it can be used as a tool for monitoring driver behavior and performance. Finally, in the event of an accident or incident, footage from an onboard camera can be extremely valuable in determining what happened and who may be at fault.