6 key features of Honda’s first partially self-driving car

5 Mar 2021

The Honda Legend Hybrid EX. Image: Honda

Honda’s new Legend Hybrid EX self-driving car, which has level-three automation features, has launched in Japan.

Honda’s first partially self-driving car is being leased in a limited 100-vehicle batch in Japan from today (5 March) at a price of $102,000.

The Tokyo-headquartered motor company’s Legend Hybrid EX vehicle features level-three autonomous technology, which means a car can drive autonomously with certain conditions and with human supervision.

While many companies are working on self-driving tech and Elon Musk claims Tesla will have full-self driving capabilities by the end of the year, Reuters reports that Honda is the world’s first company to sell a vehicle equipped with certified level-three automation technology.

Honda’s Sensing is a suite of advanced safety and assisted-driving tech already present in many of its vehicles across the globe. The updated variation in the Legend car, Sensing Elite, brings a number of new features, including a traffic jam pilot function, hands-off and emergency stop assist.

Traffic jam pilot

Traffic jam pilot technology allows the self-driving system to take control of the car when it’s in congested traffic. It determines the position of the vehicle and road conditions using data from 3D high-definition maps and a global navigation satellite system, and detects the vehicle’s surroundings using external sensors.

A monitoring camera mounted on the outside of the vehicle also tracks the condition of the driver. All of this gives the system the power to recognise current conditions and anticipate those of the future. Honda says that it applies a high level of control to acceleration, braking and steering inputs to assist the driver and “achieve high-quality and smooth driving”.

Developing this tech involved testing 10m patterns of real-world situation simulations and demonstration tests.


The hands-off function means that when the driver switches on adaptive cruise control with low-speed follow and lane-keeping assist, and in certain road conditions, the system will help control the driving operations even if the driver takes their hands off the steering wheel.

Adaptive in-lane driving

This feature helps the car follow other vehicles detected ahead within a recognised lane. It keeps the car driving along the centre of the detected lane with a pre-set vehicle speed and when it detects another car in front, automatically follows it at an appropriate following distance.

Active lane-change assist

If the driver is using adaptive in-lane driving and wants to change lanes, they can activate the indicator when it’s safe to go. The car will then automatically initiate throttle, braking and steering inputs to allow the car to change lanes.

This feature can also be used under system assessment instead of driver assessment. In this case, the car can assess the situation and notify the driver of another vehicle driving at a low speed ahead, and can assist with overtaking.

Emergency stop assist

This safety function kicks in if the driver doesn’t react to multiple system requests to transfer control of the self-driving system back to the human. If this happens, the system will decelerate the car and stop it by making a lane change to the road’s outermost lane or shoulder.

It will also disengage the traffic jam pilot and hands-off functions and initiate visual, auditory and tactile alerts in an attempt to notify the driver, such as escalated alarm sounds and vibrations in the seatbelt. If the driver continues to be unresponsive, the system will assist deceleration and stop the vehicle while alerting other vehicles around it using hazard lights and the horn.

Human-machine interface

One of the key functions of the Honda Sensing Elite system is its human-machine interface, which allows the driver to instantly recognise the system’s operating status, the driving situation and any handover requests.

Lights are present on the steering wheel, as well as the top part of the navigation screen and the glove compartment. When the hands-off function is activated, for example, indicator lights on the steering wheel show up in a different colour than they would if the traffic jam pilot function was being used.

When the system is requesting a driver handover, all the lights in the vehicle will switch to orange and blink.

Lisa Ardill was careers editor at Silicon Republic until June 2021