Hydroplaning is dangerous. Water can build up under the vehicle's tires so they actually ride on the water. This can happen if the road is wet enough and you are going fast enough. When the vehicle is hydroplaning, it has little or no contact with the road.
There is no hard and fast rule about hydroplaning. The best advice is to slow down when the road is wet.
Mazda 2. Driving In Flooded Area
WARNING
Dry off brakes that have become
wet by driving slowly, releasing the
accelerator pedal and lightly applying
the brakes several times until the brake
performance returns to normal:
Drivin ...
Skoda Fabia. Service Interval Display
A message concerning the kilometres and days remaining until the next
service is due is shown for about 10 seconds after the ignition is switched on
until the end of the service interval is reached. ...
Chevrolet Sonic. Daytime Running Lamps (DRL)
DRL can make it easier for others to see the front of your vehicle during the
day. Fully functional DRL are required on all vehicles first sold in Canada.
This indicator light turns on in the ins ...