When moving in the direction of this ascent, reversal is allowed if:
It can be done in one go
100 meters visibility is ensured from both sides✓Bonne réponse
Prohibited.
Explication
Near the crest of a rise, this manoeuvre is lawful only when the driver has a clear view for at least 100 metres in each direction. Completing it in one continuous movement does not compensate for restricted sight distance.
