The big debate going on lately is should Tesla have told investors Tesla might be subject to a lawsuit from the death of a driver while driving a Tesla X using the “Autopilot” function.

If you read this reddit thread started by the author of the controversial Fortune article you would think that it does. But if you read down the author talks about how he owns a Prius V with adaptive cruise control (ADC). He loves it and would gladly buy a self driving car. Well, the Tesla is not a self driving car. I seriously doubt that Toyota is telling shareholders anytime a Prius with ADC has an accident. And having a Prius V with ADC my self,f if anyone actually believes that you can let the car always keep a safe distance, you learn very quickly, just like the folks driving Tesla’s you can’t.

First of all “autopilot” on Tesla cars is no more than a really great adaptive cruise control with lane keeping ability. They do a far far better job than my Prius does at not hitting cars ahead of you and can actually bring the car to a full stop unlike the Prius. But neither one will keep you safe. You still have to pay attention. If not, at best you’ll wreck a car or two. At worst you’ll kill someone.

Of the 20k plus miles I have put on the Prius, many using cruise control the car has accelerated towards stopped cars or failed to slow down before I thought it would be prudent to intervene many, many times. So many in fact that I only use it on the highway or city streets with light traffic.

Today I was in a situation where a driver decided he was in the wrong lane abruptly pulled out in front of me. He was slowed on the beginning of an exit ramp doing about 35 MPH. I was on the highway doing 65. He cut out in front of me causing me (not the car) to slam on the brakes nearly avoiding his back bumper.

He politely waved sorry to me with cellphone in hand. Maybe he had to go left instead of right to get Pokemon. All I could think is what an asshole and I was glad that the truck behind me was keeping a safe distance. Something that most people don’t do as the Prius will keep about 6 car lengths from the car ahead of you at highway speeds.

Now up until this point I have put autopilot in quotes. That sort of implies that autopilot as Tesla bills it is not really an autopilot. The problem here is most people don’t really understand what an autopilot is. I do. I use one every day I get in an Airbus 320 and fly across the country. My day job is as a pilot for a major airline. I am a Captain with Type Ratings in both Airbus and Boeing airplanes. Specifically the A320 and Boeing 737 families.

The Tesla is not a self driving car and airplanes do not fly themselves. Autopilots are used to reduce workloads. They do not allow you the luxury of not paying attention.

There are several levels of automation in an airplane just like in a car. In their simplest form they might just hold the airplanes heading and altitude. This is what’s known as a two axis autopilot. That’s what we had on the 737. The A320 has a three axis autopilot. That adds Yaw control. This function moves the rudder. Those are the basics.

Now lets add on the Flight Management and Guidance Computer (FMGC). This does much more. This is the system that allows you to program in a course and follow it. This interfaces with the autopilot. Think of it as adding GPS to lane keeping or steering.

We haven’t even gotten to the cruise control system or what’s known as auto throttle or auto thrust. . This function allows you the set a fixed (not distance from a plane in front of you) speed and keep it.

All these things combined are what most people think of as autopilot. Yet as a pilot we don’t really need any of these things to fly airplanes. They just make it a heck of a lot easier or safer.

But there are several things that all of these tools cant’t do. They won’t keep you from hitting a mountain, flying off the end of the runway, hitting another airplane in mid-flight or flying through a thunderstorm. All of those things require somethings that computers, at least today, can’t do, Make complex decisions that require human intervention.

There are warning system on airplanes that let the pilots know if they are about to hit a mountain or another airplane. There is weather radar. But none of these interact with the auto flight systems. So when you hear people say that modern airplanes pretty much fly themselves, they don’t. They still need pilots. At least two of them. If one dies or becomes incapacitated they aren’t going to drop in another pilot or a passenger isn’t going to land the plane. For that would require a lot more knowledge than you can learn in a couple of hours.

I’m not sure if you will see an airplane without pilots or a self driving car first but don’t make the mistake of thinking an “autopilot” will allow the operator to totally give up control of the vehicle.

You don’t want your pilot to be asleep at the wheel and you don’t want your driver to be asleep at the wheel either. That’s another reason there are two pilots on commercial airliners. It’s always ones job to FLY THE AIRPLANE. Autopilot on or not.

But I will tell you one thing. An airplane in flight is far more forgiving if the pilots are not paying attention than a driver on a road.

In cruise (at altitude) the closest airplane is going to be at least 5 miles away and 1000 feet above or below you. On the road you have cars within a few feet of each other going 70 MPH. In most big jets you have at least 2 pilots at the controls most of the time.

In an airplane I will get about 20-30 seconds to react if someone comes closer than they should. In a car you might have a few seconds if you’re lucky. Today if I hadn’t reacted immediately, I would have been in that guys back seat. I didn’t even hear the collision warning indicator go off. It felt like the car was never going to stop or slow down quick enough to not hit him. Braking distance in a Prius isn’t all that great.

Back to the Tesla accident. Maybe since the same guy who died had previously made a video of the car saving him he got far to comfortable with the technology. Maybe it works so well that people think it can do far more than it can.

Autopilot isn’t set it and forget it. And if you remember that you will be safer than any other driver on the road who doesn’t understand what autopilot can and can’t do.

Tesla’s stock might have taken a hit but their bottom line won’t. At least not because of this.

I’m all for more safety features in cars. I love backup cameras and sensors. I love blind spot warnings and many things available in the newest cars. I think all cars should have them. But none of these things should let the driver think they don’t have the responsibility to look.

Tesla may not have invented any of these things but they are making people aware of them and other manufactures have taken notice. Let’s not let this accident or any other accident hamper the advance of safety because some people are too complacent to use them properly.

These things will save lives. Look at how few planes crash now days.