Driver engagement is a topical concept that underpins safety conversations around take-over with assisted and automated driving systems. Today, assisted driving systems available and in development require that the driver maintains responsibility for all aspects of vehicle operation at all times. In practice, many auto-makers have had a choice between adopting either camera-based monitoring systems or hands-on the wheel sensors in their vehicle designs, but this is changing as Euro NCAP, European Commission and other bodies recognise the value that camera-based sensing brings to the safety case. As the capability of automated systems increases, the role of the driver and vehicle will evolve – both will need to operate and interact seamlessly as co-pilots of the vehicle system. Understanding the state of the driver is a critical enabler for safe takeovers, particularly as more advanced systems will have increased scope for choosing when they do or don’t transfer control. How is a safe and acceptable driving experience going to be achieved? Existing research will be presented that makes the case for camera-based driver monitoring, focusing on how technology that monitor’s a driver’s ocular movements is more effective at ensuring safety than other approaches. Ultimately, the presentation will outline that camera-based driver monitoring underpins the pinnacle of interior-sensing, promising full-integration with Advanced Driver Assistance Systems (ADAS) enabling appropriate interventions that have the potential to dramatically reduce road accidents.