When is it obligatory to operate the vehicle’s different types of decelerators or retarders ?

1. When driving on a road section before which a “sharp curve” sign is placed.
2. When driving on a road section before which a “danger of slipping” sign is placed.
3. When driving on a road section before which a “hairpin curve” sign is placed.
4. Correct answer: When driving on a road section before which a “dangerous descent” sign is placed.

WhyRetarders must be used on the road section after a dangerous descent sign. On a long descent the ordinary brakes overheat.