text: , one specific sensor is the special touch sensor which makes sure that the driver keeps their hands on the wheel at all times . Besides that there is also seats that viberate to alert the driver and flashing lights on the window shields , which would add on to the price of a car. Also stated in the passage that so far none of the cars are completely driverless. They can steer , accelerate and brake themselves but they still notify the driver when the road ahead requires human skills . This means the human driver must be alert and ready to take over at all time. Which might not always happen , a driver may not always be attentive of the road ahead even with alerts included in the car. Which brings up the case of a drivers, passengers , and pedestrians saftey , and lawmakers know that saftey is best achieved with alert drivers , which is stated in the passage. Traffic laws are written with the assumption that the only safe car has a human driver in control at all times. Infering to why in most states it is illegal even to test computer driven cars. Yet even if traffic laws change , new laws willl be needed in order to cover liability in the case of an accident. If an accident were to occur due to the technology failing , who is to blame the driver or the manufacturer. A Facial Action Coding System is where it sees if you're happy, sad, surpised, anger, digust, and fear. How? It will tell by have a picture of a no emotional , than compare to your see what's the diifference.