Apart from Active Brake Assist 4 and Sideguard Assist, which on the world's bus market are only available from Daimler Buses, there are many further tried and tested driver assistance systems in the S 531 DT: the Electronic Stability Program (ESP), the adaptive cruise control, Lane Assist, Attention Assist as well as the tyre pressure monitoring system. What's new, however, are the LED headlamps as standard, which offer significantly more brightness than conventional halogen lights and therefore illuminate the road even better. The light of the new LEDs reduces eye fatigue, as it is more similar to natural daylight. The LEDs' durability and nearly undiminished light intensity throughout their entire lifespan also contribute to increased safety.
Also part of the new S 531 DT's standard equipment is a TÜV-certified (German Technical Inspection Authority) automatic fire extinguishing system. And that's before this feature becomes a legal requirement for coaches in June 2019. This system uses detection lines that initiate the extinguishing process in response to a pressure drop, which is caused by major overheating. The extinguishing fluid is pressed through the nozzles of the distribution system, and sprayed out in the form of high-pressure water mist in the engine compartment. This causes the displacement of oxygen within fractions of a second, hereby removing the basis for the fire. At the same time, the surfaces of the components are cooled, preventing the fire from being re-ignited. The pipeline for the extinguishing fluid runs through the entire engine compartment. The individual nozzles are specifically aimed at the components that reach higher temperatures, such as the turbocharger, oil filter module and auxiliary heater.
Primarily, Setra focuses on the prevention of accidents by means of active safety systems such as Active Brake Assist 4 and Sideguard Assist. However, should an accident still occur, both driver and passengers profit from the best possible passive safety. For instance, the S 531 DT incorporates its previous model's reinforced framework, and therefore voluntarily fulfils the requirements for passing the pendulum impact test as specified in the ECE-R-29 guideline. In addition, Setra provides rescue services with rescue data sheets for all of its buses online.