Many new SUVs offer fantastic off-road capabilities that take much of the guesswork out of navigating challenging trails and managing different types of terrain. Even luxury SUVs provide some of the goodies, including Mercedes-Benz, which has offered several trail-friendly features over the years, including Downhill Speed Regulation (DSR). Traversing hills off-road can be tricky, especially on loose terrain or when there are significant obstacles on the way down. Mercedes’ DSR system helps sort those problems out by managing the vehicle’s speed while the driver focuses on steering, throttle, and braking inputs.
Though it has a fancy brand name, Mercedes DSR is nearly identical in functionality to the hill-descent control technology that other automakers offer. Companies, including Ford, Toyota, and others, offer the feature, which allows drivers to set a constant speed and focus on the basics. It’s worth noting that these features differ from those like Ford’s Trail Control and Toyota’s Crawl Control. Those functions offer cruise control-like speed control on the trail and may work with hill-descent control.
Mercedes DSR works in various conditions but only in a narrow speed range. It’s also adaptive to the grade of the hill, so it provides more braking force on steeper hills than others. Drivers activate DSR when the transmission is in Drive, Reverse, or Neutral and can set a target speed between around one mph and 11 mph. Like standard cruise control, the driver can apply more throttle or braking to change the speed. However, accelerating past 28 mph deactivates the system.
Of course, countless variables impact traction and stability off-road, including the temperature, tire quality, and how packed the trail surface is. Mercedes notes that DSR might be unable to hold a consistent speed over some surfaces and says that the driver must pick a suitable target speed for the environment.
Some Mercedes models feature dedicated DSR toggles in the cabin, while the automaker hides the function in the infotainment system in others. To activate using the touchscreen, the driver must choose the settings menu and then the assistance menu. You can activate the system if the vehicle is traveling at less than 28 mph. Otherwise, the vehicle flashes a speed message in the gauge cluster. When active, the feature displays a DSR icon in the cluster. The driver can change speed using the vehicle’s steering wheel cruise control functions, and the system allows incremental adjustments of 1 mph.
Mercedes offers DSR on several models, including a wagon in the United States. Models available with the function include the GLA, GLB, GLC, GLE, and GLS SUVs. The E-Class All-Terrain wagon also gets the feature. Mercedes hasn’t left its electric vehicles (EVs) out in the rain, as the EQE and EQS SUVs offer the feature. Though it currently has just two electric SUVs in its catalog, the automaker has announced plans to convert entirely to EV sales by 2030, so the number of models featuring DSR will likely increase in the coming years.
Mercedes’ DSR system can make off-roading much more confident and safe. To learn more about vehicles with the feature and similar tech, head to the Shopping Guides section of the website.
Chris Teague is an experienced writer in the automotive and technology fields. In addition to JDPower.com, his work appears at Forbes, Your Test Driver, Autoweek, and others.
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