The 5 Autonomous Driving Levels Explained

Understand the different levels of driving automation to know where we stand with this rapidly advancing technology.

Isabel Harner
IoT For All


Autonomous driving is no longer a futuristic dream, it’s becoming a reality. Every week, companies are announcing their commitment to developing and launching autonomous vehicles, and many of these announcements note the “level” of autonomy being developed.

Autonomous driving can definitely be scary to some, but it’s hard to deny the benefits. We’d see decreased congestion, reduced emissions, more efficient parking, lower transportation costs for everyone as well as a reduction in the cost of new roads and infrastructure. It would also greatly improve the mobility of elderly and disabled people.

There are 5 different levels of driving automation that you need to know to understand where we currently stand with this rapidly advancing technology. Here is a simple explanation of each level of autonomy.

5️ Autonomous Driving Levels 🚗

0️⃣ Level Zero — No Automation

At Level 0 Autonomy, the driver performs all operating tasks like steering, braking, accelerating or slowing down, and so forth.

1️⃣ Level One — Driver Assistance

At this level, the vehicle can assist with some functions, but the driver still handles all accelerating, braking, and monitoring of the surrounding environment. Think of a car that brakes a little extra for you when you get too close to another car on the highway.

2️⃣ Level Two — Partial Automation

Most automakers are currently developing vehicles at this level, where the vehicle can assist with steering or acceleration functions and allow the driver to disengage from some of their tasks. The driver must always be ready to take control of the vehicle and it still responsible for most safety-critical functions and all monitoring of the environment.

3️⃣ Level Three — Conditional Automation

The biggest leap from Level 2 to Levels 3 and above is that starting at Level 3, the vehicle itself controls all monitoring of the environment (using sensors like LiDAR). The driver’s attention is still critical at this level, but can disengage from “safety critical” functions like braking and leave it to the technology when conditions are safe. Many current Level 3 vehicles require no human attention to the road at speeds under 37 miles per hour.

Audi and others have announced Level 3 autonomous cars to launch in 2018. An autonomous vehicle expert at Ford noted that they plan to take the company straight to Level 4, saying “We’re not going to ask the driver to instantaneously intervene — that’s not a fair proposition.”

4️⃣ Level Four — High Automation

At Levels 4 and 5, the vehicle is capable of steering, braking, accelerating, monitoring the vehicle and roadway as well as responding to events, determining when to change lanes, turn, and use signals.

At Level 4, the autonomous driving system would first notify the driver when conditions are safe, and only then does the driver switch the vehicle into this mode. It cannot determine between more dynamic driving situations like traffic jams or a merge onto the highway.

5️⃣ Level Five — Complete Automation

Last and least (in terms of human involvement), is Level 5 autonomy. This level of autonomous driving requires absolutely no human attention. There is no need for pedals, brakes, or a steering wheel, as the autonomous vehicle system controls all critical tasks, monitoring of the environment and identification of unique driving conditions like traffic jams.

NVIDIA recently announced an AI computer to help achieve level 5 autonomy, where drivers simply plug in their destination and leave the rest up to the vehicle itself.

Hopefully this post helps you navigate the news around autonomous vehicles and understand at what levels companies are developing them. Now, how our society, government, and city planners will adopt and address this gigantic shift in transportation is a question for another time. 🤔

For a more in-depth look into these levels, check out the resources below:

Originally published on on October 23, 2017.

Want all the latest advances and tech news sent directly to your inbox?



Isabel Harner
IoT For All

Director of Marketing @ IoT For All, Leverege | Venture For America Fellow