Even milliseconds can be decisive in an emergency situation, in which case the passenger compartment of the R-Class provides a reliable protective panel for the occupants. Special attention was paid during the construction of the vehicle body to the protection of other road users in order to reduce the risk of injury to other people in traffic. Should a collision nevertheless occur, a sophisticated system of airbags can come to the rescue. The driver and front passenger can be protected during a head-on collision, depending on the severity of the impact, by standard front airbags (which deploy in two stages) as well as sidebags. The second seat row can have sidebags integrated into the backrests as an option. In the event of a side collision, or a roll-over, windowbags can expand like a curtain to protect all the seat rows. The driver and front passenger seats, as well as the rear seats in the second row for 4+2, 5 and 5+2-seater, are fitted with 3-point seat belts and belt tensioners as standard. Like the front seats, the outer seats in the second row also feature belt force limiters.