This paper provides an overview of the provisions of the first international agreement concerning level 3 of the autonomous driving, UN Regulation No. 157 „Uniform provisions concerning the approval of vehicles with regard to Automated Lane Keeping Systems“. At the centre of the observation is the automated lane keeping system (ALKS) which, in certain conditoins performs driving task instead of driver, who must be available at all times and ready to take back control of the vehicle. In order for a vehicle to be equipped with ALKS it must pass the vehicle type-approval procedure carried out by the competent vehicle-type authority. ALKS recognises driver's availabillity and attentivness, and in case it determines drive's unavailabillity, initiates the transitoin demand procedure. In the event of an imminent collision risk, ALKS is designed to avoid any collision that could be avoided by a skilled and careful driver, but the collision will not always be successfully avoided. The paper provides an overview of different scenarios, in which case ALKS may fail to avoid the collision and an overview of how ALKS successfully avoids collision. In the event of of a collision, ALKS is designed to bring the vehicle to a standstill, and ALKS data storage system (a kind of black box for ALKS) records the data and makes it possible to clarify the cause of the accident. The amendments adopted in 2021 and 2022 extended the application of the ALKS, which no longer serves only for low speed driving, as limited by the original text of the Regulation, but also allows ALKS to reach the speed up to 130 km/h.