What Highway Driving Assist does

The 2027 Tucson owner's manual describes HDA as a function that helps maintain a set distance and speed from the vehicle ahead while driving on a highway main section, and helps center the vehicle in the lane. On the Tucson it uses two sensors: the front view camera and the front radar.

The Tucson page on hyundaiusa.com, read November 4, 2026, lists HDA as standard on the SEL Premium and Limited trims. Its disclaimer says HDA is for highway use only, works only when lane markings are clearly visible, and should not be used in poor weather, heavy or varying traffic, or on winding or slippery roads.

The roads HDA works on

HDA is available only on controlled access roads: roads with limited entrances and exits that allow uninterrupted high speed traffic flow. In the USA the manual lists select Interstate Highways and U.S. (Federal) and State Highways, and says additional highways may be added in future navigation updates.

It does not operate on interchanges or junctions. HDA turns off automatically on roads where it does not operate, such as a rest area, intersection or junction, and when the navigation is being updated or restarted. Because it depends on navigation information, it may also operate or turn off unexpectedly depending on road conditions and surroundings.

How to turn HDA on

With the engine on, choose Setup > Vehicle > Driver Assistance > Driving Convenience > Highway Driving Assist on the infotainment system to set whether the function is used. After that, HDA starts in either of two ways:

• You are on the main road of a highway and press the Driving Assist button.
• You enter the main road of a highway while Lane Following Assist and Smart Cruise Control are already operating.

HDA will not operate when the vehicle is first started, or while the sensors or navigation are being initialized. If Smart Cruise Control is temporarily canceled while HDA is running, HDA goes to standby and Lane Following Assist continues to work.

What the cluster colors mean

From Highway Driving Assist Operation in the 2027 Tucson owner's manual, pages 7-100 and 7-101. The Driving Assist view also shows the set speed, the Lane Following Assist indicator, whether there is a vehicle ahead with the selected headway, and whether the lane is detected.

Stopping and restarting in traffic

When HDA is operating and the vehicle ahead stops, your Tucson stops too. If that vehicle starts moving within 30 seconds, yours starts as well. Once 30 seconds have passed after the stop, a "Use switch or pedal to accelerate" message appears; press the accelerator or use the +, - or resume switch to move off.

Hands-off warnings and the 40 mph limit

Hyundai says to always keep your hands on the wheel. If you take them off for several seconds, the warnings come in stages:

1. First stage: a "Keep hands on steering wheel" message.
2. Second stage: the message with a red steering wheel and an audible warning.
3. If your hands are still off, "Highway Driving Assist deactivated" appears and HDA is canceled automatically.

After a hands-off cancel, Driving Speed Limit helps you drive below 40 mph (60 km/h); the vehicle slows for traffic ahead and cannot accelerate on its own. It ends when you grab the wheel again, press the Lane Driving Assist button, use the cruise switches, or press the accelerator or brake. On vehicles with Emergency Stop, the manual says HDA behavior may differ and the emergency stop function activates if you do not keep holding the wheel.

Limits Hyundai lists

The manual says the driver is responsible for controlling the vehicle, and that HDA may not detect vehicles, motorcycles, bicycles, pedestrians or structures such as guardrails and tollbooths. It may not operate properly, or at all, when:

• the navigation map and the actual road differ, or GPS signals are blocked, for example in a tunnel
• the infotainment system is overloaded with route search or voice recognition, or Android Auto or CarPlay is operating
• the route is changed or canceled, or the vehicle enters a service station or rest area
• a white single dotted lane line or the road edge cannot be detected, the road is under temporary construction control, or there is no median strip or guardrail
• a trailer, carrier or similar attachment is installed

Turn HDA off when towing a trailer or another vehicle. If "Check Driver Assistance system" appears with the yellow Lane Keeping Assist warning light, have the vehicle inspected by an authorized Hyundai dealer. Our service team can check the camera and radar; you can schedule service online.

Michigan City Hyundai service hours

From Michigan City Hyundai's website, November 4, 2026. The website lists Monday to Saturday service hours and none for Sunday. Holiday hours can differ.