To resume cruising speed at more than approximately 25 mph (40 km/h)

If any method other than the CRUISE ONOFF switch was used to cancel cruising speed and the system is still activated, the most recent set speed will automatically resume when the RES/+ switch is pushed. It will not resume, however, if the vehicle speed has dropped below approximately 25 mph (40 km/h)
See also:
SUN VISOR
Your Hyundai is equipped with sun visors to give the driver and front passenger
either frontal or sideward shade. To reduce glare or to shut out direct rays of
the sun, turn the sun visor down.
...
Armed stage
Using the smart key
Park the vehicle and stop the engine.
Arm the system as described below.
1.Turn off the engine.
2.Make sure that all doors, the engine hood and trunk lid are closed and latched ...
Highway driving
Tires
Adjust the tire inflation pressures to specification. Low tire inflation pressures
will result in overheating and possible failure of the tires.
Avoid using worn or damaged tires which may ...


