1
What is?
is a car with automatic drive fractionation of human driver of the vehicle occupied by different automatic driving system operating ratio, automatically classifying the vehicle driving performed
.
2
grading standards
NHTSA
2013, the United States the national Highway traffic safety Administration (NHTSA), released the first autonomous vehicles grading standards, which describes the automation is divided into four levels:
specific automation functions: automatic driving assistance includes basic functions such as anti-lock, electronic stability control, lane keeping and other similar functions.
partly automated: the integration of multiple functions, usually including adaptive cruise control and lane keeping functions, the car can drive automatically but requires frequent monitoring and timely intervention of a human driver.
Conditional automation: fully automatic driving, but under different circumstances, the process of moving may require the driver to make a human decision, but a human driver need not make a timely response.
completely automated: Car without human intervention, can make a decision
themselves 
.
SAE
2014, the American Society of Automotive Engineers (SAE) also developed a set of autonomous vehicles grading standards, which describe automation is divided into five grades
driving support: provides support for a driver operating the steering wheel and ramp through the driving environment,Other driving action by a human driver to operate.
partial automation of: providing a driving wheel supported by the driving environment and ramping operations in a number of other driving operation by the human driver operates.
Conditional automation: the autopilot system to complete all of the driving operation. According to the system requirements, the human driver to provide an answer adaptation.
highly automated: the autopilot system to complete all of the driving operation. According to the system requirements, the human driver does not necessarily need to respond to all requests of the system, limited road and environmental conditions.
fully automated: In all human driver can cope with road and environmental conditions, can be independently completed by the autopilot system all driving operation.
3
You know what?
September 2016 US Department of Transportation issued the “American autonomous vehicles policy guidelines”, formally established by the United States Society of Automotive Engineers (SAE) is defined as a measure of automobile autopilot level of standards , from lowest to highest for the non-automatic (the L0), driving assistance (L1), partial automation (L2 of), conditional automation (L3), high degree of automation (L4) and fully automated (L5).