Recently, Li Auto released some popular questions on smart driving without pictures of NOA, including what is picture-free NOA? How to define pictures and no pictures, and what is the difference/improvement in experience? What should I pay attention to when making a NOA without a map? Five other questions.

1. What is a no-image NOA?

The map-free NOA does not rely on prior information such as high-precision maps, and can be used on all navigable urban roads across the country. By turning on mapless NOA, you can automatically switch lanes, autonomously overtake and change lanes, bypass obstacles, adaptively adjust cruise speed, respond to traffic lights to start and stop, and automatically pass intersections and other driving tasks in the city according to the navigation path.

2. Why does NOA without a picture still need navigation? What is the relationship between the two?

NOA stands for Navigation Assisted Driving. It does not rely on prior information such as high-precision maps, but relies on basic GPS navigation map services to provide accurate route planning and driving assistance, such as traffic rules, road types, etc. Ensure driving safety and compliance. That is, only when the driver sets the navigation destination can he initiate navigation-assisted driving.

3. Why do only AD Max (with lidar) models have NOA without pictures?

NOA without pictures is currently Li Auto's most advanced mass-produced intelligent driving capability, especially for complex urban road conditions, the experience has been significantly improved. The underlying architecture of the AD Max model is different from that of the AD Pro. It is based on the occupancy network that integrates lidar and vision front, and its perception and planning capabilities for general obstacles are significantly enhanced.

Driving assistance functions in complex urban environments place higher requirements on chip computing capabilities and sensor hardware. Only the AD Max system equipped with dual Orin-X chips supports the urban NOA function; the current AD Pro model only has high-speed NOA capabilities and does not support urban NOA yet.

4. How to define pictures and no pictures, and what is the difference/improvement in experience?

The key difference between "without pictures" and "with pictures" lies in whether prior information is used to assist the vehicle in navigation and decision-making. Mapless NOA does not rely on prior information such as high-precision maps, broadening the scope of use, allowing mapless NOA to demonstrate excellent adaptability and reliability in various environments, and achieving significant improvements in overall performance.

NOA without pictures has the following four obvious advantages: it can drive anywhere, has smooth detours, is easy at intersections, and has a tacit understanding and peace of mind.

· Can drive anywhere, no map, no prior information: No need to rely on "prior information" such as high-precision maps, light maps, etc., no need to "open cities", not limited to cities or towns, as long as the car terminal can initiate navigation , you can turn on NOA.

· Smooth detour, time and space combination: Continuously predict the driving trajectories of your own vehicle and other vehicles, with joint time and space planning capabilities, and synchronized planning of vehicle horizontal and vertical control, when encountering vehicles, pedestrians, cyclists, and special-shaped obstacles occupying the road Wait, you can choose the optimal route and make a decisive detour like an experienced driver.

· Easy intersection, God’s perspective: The BEV visual model integrates the navigation matching algorithm, fully integrates the lane structure and navigation characteristics, and opens a God’s perspective for the vehicle. More accurate route selection at complex intersections, easier passing, less takeovers, and higher efficiency.

· Tacit understanding and peace of mind, decimeter-level micro-operation: The occupancy network that integrates vision and lidar can identify irregular general obstacles such as curbs and safety islands earlier. Traffic participants who encounter the right-of-way game have earlier warning and more appropriate timing of acceleration and deceleration.

5. What matters need to be paid attention to in NOA without pictures?

Intelligent driving is in the development stage, and the product experience has also been greatly improved. However, in some complex traffic conditions, there is still a gap between it and experienced human drivers. In the face of some complex scenarios, we would like to remind everyone that the vehicle may not perform as expected under these circumstances. You must stay focused and take over in time.

① Be careful at intersections and merging scenes, and stay alert at all times.

· It is recommended to pay attention in advance and prepare for defensive evasion when crossing an intersection.

· When turning left without protection, the system needs time to respond when encountering other aggressive vehicles. Especially when turning to pass an oncoming large vehicle, you need to pay attention to the fast and straight traffic coming behind the large vehicle.

· There are many left-turn lanes, so be careful to quickly cut in from the outside of your vehicle orSocial vehicles intending to overtake in a curve from the inside should avoid bumping during the curve.

· When vehicles merge, vehicles approaching quickly from the side and behind are blind spots in human vision. You need to pay attention to the vehicles coming from behind through the rearview mirror or side rear window to ensure the safety of merging.

② Don’t challenge extreme scenarios, take over promptly and decisively.

· The weather and light conditions are poor, or there are damages or low obstacles on the ground, etc., which exceed the working range of the sensor hardware and require timely takeover.

· If you encounter reckless, aggressive, abnormally driven social vehicles, or sudden appearance of two or three-wheeled vehicles, it is recommended that you give advance warning and avoid them.

· When there is an accident ahead and the car in front brakes suddenly, it is recommended to take over and avoid it as soon as possible to prevent collision and avoid rear-end collision with the car behind.

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Editor in charge: Jiang Haibin