Adaptive cruise control is an advanced driver-assistance system that gives drivers more assistance by automatically changing the speed of their car depending on how close it is to the vehicle that it is following.
Adaptive cruise control (ACC) accomplishes this by using radar, cameras, and lidar technologies to see how far away traffic is from the driver & determining when to slow down or use brakes. And when to speed back up after the traffic clears.
ACC makes driving much less tiresome on long trips & helps make stop-and-go traffic much less stressful while improving the safety of drivers in preventing rear-end collisions.
- Adaptive cruise control (ACC) maintains your set speed while automatically adjusting to the car ahead.
- ACC uses radar, cameras, and lidar Sensors to determine how far away and how fast traffic is moving.
- It reduces driver fatigue on long drives and in traffic, but you must stay attentive and ready to take control.
- ACC is safer than regular cruise control in most situations, though it has limitations in bad weather or complex scenarios.
What Is Adaptive Cruise Control?
Adaptive cruise control, or ACC, is an adaptive form of traditional cruise control that provides additional functionality to maintain your car’s set speed while automatically adjusting to the car ahead.
Depending on the vehicle manufacturer & the system itself, you might hear different terms interchangeably with Adaptive Cruise Control, including:
- Active Cruise Control
- Dynamic Cruise Control
- Automatic Cruise Control
- Intelligent Cruise Control
- Smart Cruise Control
- Radar Cruise Control
Regular cruise control maintains whatever speed you set, regardless of what is happening in the surrounding environment. Adaptive cruise control uses sensors to monitor the highway and adapt to changing traffic conditions, allowing it to maintain a safe distance behind the vehicle in front of it by automatically adjusting your speed based on the distance that you have set.
When you use ACC, you will set your desired speed & select the distance that you want to follow the vehicle in front of you, which can typically be selected as short, medium, or long.
Once you have set the distance, the adaptive cruise control system is designed to control your accelerator and brake based on the current speed and distance between vehicles to synchronize itself with traffic flow.
For instance, if a vehicle in front of you decreases its speed, the adaptive cruise control system will also reduce the speed of your vehicle. When traffic creates an opening for your vehicle, adaptive cruise control will return your vehicle to the pre-established speed at which you set.
Some advanced forms of ACC can stop completely when stopped in traffic and then re-accelerate when traffic moves ahead, a feature that is referred to as stop-and-go ACC.
ACC may be implemented as a Level 1 or Level 2 driver assistance technology. Although ACC is capable of automatically controlling vehicle acceleration and braking, the driver is still ultimately responsible for steering the vehicle and maintaining complete situational awareness.
How Does Adaptive Cruise Control Work?
Front-facing sensors are the primary means through which Adaptive Cruise Control (ACC) obtains data about the surrounding traffic:
- Radar uses radio frequency technology to bounce radio waves off vehicles. This helps it measure distance, direction, and speed relative to other vehicles.
- Camera-based technology uses video to identify vehicles and track lane markings/road signs.
- Lidar-based technology takes a large number of laser measurements and, from those measurements, creates a high-accuracy 3D map of the location of all objects in the vicinity.
- Multi-sensor systems work together to increase the accuracy of the Adaptive Cruise Control system by combining the radar, cameras, and sometimes lidar.
The easiest way to understand how it works is that Adaptive Cruise Control compares the distance between you & a vehicle. If the distance between you & the vehicle in front of you is too small, or the vehicles are travelling at significantly different speeds, ACC reduces throttle or applies brakes.
If you overtake the vehicle, or if the other vehicle speeds up, ACC will accelerate smoothly back to your chosen speed setting.
In addition to front-facing sensors, many advanced Adaptive Cruise Control systems use GPS and map data to predict lane changes or changes in traffic conditions in order to facilitate safe driving.
Usually, the Control Function is located on the steering wheel. You can activate the ACC system, set your desired speed using the +/- buttons, and set the distance from the vehicle ahead. You can override the system by using either the brake or accelerator pedals.
Advantages of Adaptive Cruise Control
The benefits of having adaptive cruise control (ACC) would include:
- Reduced fatigue because you won’t need to be constantly adjusting your vehicle’s speed when driving in traffic.
- Increased safety by consistently maintaining a safe following distance, lowering the chance of a rear-end collision.
- Improved overall traffic flow due to smoother acceleration and deceleration, which reduces the likelihood of stop-and-go driving conditions.
- Stop-and-go capabilities for several 2026 models can handle complete stops and will continue to move from a standstill while the driver is in heavy traffic.
- Better fuel economy with ACC because of the ability to maintain a constant speed and gradually increase & decrease speed while on the highway.
It’s true! Cruise control saves gas efficiently when you’re driving on flat highways & can keep your speed consistent to sip fuel instead of gulping it.
Disadvantages of Adaptive Cruise Control
ACC isn’t perfect. Here are the main downsides associated with using it:
- Not an entirely autonomous system, as you must always have both hands on the steering wheel & your eyes on the road.
- Weather issues such as excessive rain, snow, and fog or other obstructions on the sensors can negatively impact ACC performance.
- No lane-changing functionality, as ACC is not equipped to change lanes automatically for you.
- Sudden cut-ins – other vehicles merging into your lane can catch some systems off guard due to their slower responses.
- Lower speed limits (25-30 mph) may deactivate basic ACC systems.
- The additional cost involved with adding ACC packages usually ranges from $500 to $2,500.
Adaptive Cruise Control vs Regular Cruise Control
| Feature | Regular Cruise Control | Adaptive Cruise Control (ACC) |
| Maintains set speed | Yes | Yes |
| Adjusts for traffic ahead | No | Yes |
| Automatic braking | No | Yes (in most systems) |
| Stop-and-go capability | No | Yes (in advanced versions) |
| Driver attention required | Full | Full |
| Safer in congestion | No | Yes |
Regular cruise control is simple and doesn’t cost as much, but it’s useless in traffic. Adaptive cruise control excels on highways & in congested areas.
How Much Does Adaptive Cruise Control Cost?
If you opt for an ACC with all available features, you might end up paying anywhere between $2000 & $2500. For minimal cruise control that would benefit speeds of up to 20-25 miles per hour, expect to pay as low as $500, according to Car and Driver.
When ACC starts to become more common, it will most likely decrease in price.
Is Adaptive Cruise Control Worth It?
If you do a lot of highway or stop-and-go driving, then adaptive cruise control is absolutely worth it. It will make your drive less stressful, safer, and a lot easier for long-distance journeys.
When used in conjunction with lane-centering, it approaches the capabilities of a Level 2 Autonomous Vehicle. If your driving is primarily in-city or you rarely use cruise control, then standard cruise control may suffice.
How to Turn On Adaptive Cruise Control
While methods vary slightly from vehicle to vehicle, they tend to be quite similar. To activate adaptive cruise:
- Find the steering wheel buttons (typically located on the left-hand side).
- Activate the system (generally indicated by a cruise control icon or “ACC” button).
- Accelerate to the speed that you wish to maintain.
- Press “SET” or “RES” to hold your selected speed.
- Adjust your speed with the “+” or “-” buttons.
- Select your following distance (short, medium, or long).
- Hit the brake or press “CANCEL” to stop.
For detailed instructions & specific icons, refer to your owner’s manual.
Frequently Asked Questions (FAQs)
What’s the difference between cruise control & adaptive cruise control?
Cruise Control only maintains a constant speed, regardless of any obstructions in the vehicle’s path. Adaptive Cruise Control maintains a safe distance from the vehicle in front of you by automatically adjusting your speed based on how close you are to the vehicle in front of you, including slowing down or stopping if necessary.
Can you turn off adaptive cruise control and use regular cruise control?
Most vehicles nowadays can toggle between regular cruise control and adaptive cruise control by accessing settings or disabling the distance-sensing feature.
Does adaptive cruise control stop?
Many advanced adaptive cruise control systems will bring your car to a complete stop in traffic. Basic systems slow down but will still require a driver to brake after coming to a full stop.
Learn about how Regenerative Braking works.
Is adaptive cruise control the same as autopilot?
No, adaptive cruise control establishes speed & maintains a preset distance from the vehicle directly in front of it. Autopilots like Tesla’s take things one step further by steering and changing lanes to navigate under certain conditions, making it more advanced (Level 2 autonomy).
Also Read: What Is The Fastest Tesla?
Is adaptive cruise control good in the rain?
ACC may work in light rain. However, heavy rain and/or fog will cause ACC’s sensor detection capabilities to decrease. Therefore, always maintain alertness in inclement weather conditions.
Final Say
Highway driving no longer creates stress and tension associated with traffic or hours on the road, thanks to adaptive cruise control. I can’t speak for everyone, but I sure do drive more relaxed knowing I have this feature.
But the fact that the ACC is a driver assistance system rather than a fully autonomous vehicle means that the driver must remain attentive. If you are a frequent highway traveler or have to deal with heavy traffic, paying extra for ACC will pay for itself many times over.
