In the event of danger
Citaro Ü

In the event of danger

The driver must react fast to the threat of an accident, in order to avert the danger. The Citaro Ü provides assistance with its directionally stable suspension and smooth steering, This is achieved by the independent suspension on the front axle.

There is particular emphasis on driver safety in the Citaro Ü. The UNECE-R 29 Directive applicable to trucks, which has defined the survival space for the driver in a head-on collision in a truck since 1975, has been voluntarily adopted as the standard for the new Citaro Ü. Compliance with UNECE-R 29 is checked by means of a pendulum impact test.

Protection in the event of a head-on collision which is based on the UNECE-R 29 standard and unparalleled amongst urban regular-service buses, comes together with the even stiffer structure of the frame to increase passive safety.

The new driver protection door can protect the driver from unexpected attacks. Depending on the intended deployment of the vehicle and the degree of protection desired, there are four modular constructions available.

The Citaro is equipped as standard with a fire detection system in the engine compartment which monitors the prevailing temperatures there. If the preset value of 160 °C is exceeded, the pressurised detection line breaks and warns the driver of the imminent danger by means of an audible alarm and visually in the driver's display with the message "Engine compartment fire detected".

If there is a malfunction affecting the vehicle's operational readiness and an activation of the system, e.g. while the bus is parked unsupervised, the driver is also informed via the message "Failure of fire detection system" in the display. 

If a temperature of approximately 160 °C is exceeded, the driver sees an alarm in the driver's display as well as the message "Engine compartment fire". Additionally, an acoustic warning tone is emitted and the extinguishing process initiated automatically. 

In the case of a fire, the pressurised detection line (Firetrace) breaks and sprays an extinguishing mixture made of water, engine coolant and a special additive via a series of nozzles around the entire engine compartment. The water mist evaporates as a result of the high temperatures and displaces the oxygen. The engine compartment is thus cooled rapidly, the fire extinguished immediately and re-ignition of the fire prevented.      



  • Low scope of repairs after the system is triggered
  • Fine water mist reduces temperatures are extinguishes the fire immediately
  • Film-forming substances make it more difficult for the fire to re-ignite
  • Not harmful to humans, engine and systems
  • Environmentally friendly extinguishing substance with anti-freeze properties down as low as -35 °C
  • Automatic triggering at high temperatures (over 160 °C or in the case of fire)
  • The system is guaranteed to function in any installation position

*Special equipment

Welcome to Mercedes-Benz Buses

Please note: on our International Page we present the German product range. The content does not apply to all countries and certain features or descriptions may not be available in your country.

To visit a country specific page please select from the list.

Should you have any questions regarding Mercedes-Benz buses or our products, please do not hesitate to contact us. We are always happy to receive your comments.

Contact us by email