Driving on **ice or snow** presents specific challenges due to the reduced grip of the tires on the road. This means that the vehicle can easily skid, and more space is needed to brake safely.

- **Using high gears** is advisable in these conditions because it allows the vehicle to move at an appropriate speed with less engine power. This helps prevent the wheels from skidding, as it reduces the likelihood of the engine transmitting too much power to the wheels, which could cause them to lose traction.

- In snowy conditions, it is recommended to choose a gear that allows the vehicle to start with more speed but with little engine power. This is similar to driving on ice, where the aim is to maintain control of the vehicle by avoiding sudden movements and abrupt changes in speed.

- Additionally, it is important **not to brake sharply** and to maintain a greater safety distance from other vehicles to have enough space to stop safely.

In summary, when driving on ice or snow, using high gears helps maintain control of the vehicle and reduces the risk of skidding, making this the safest option.