Typical situations where the vehicle might brake unexpectedly include parking in tight spaces or driving on uneven natural terrain. “As soon as the driver doesn’t react to visual and audible warnings, the assistant will brake automatically. Because the system works by reflecting ultrasonic waves, it may occasionally respond to objects that both the driver and car can easily overcome—such as curbs, tall grass, or other items that physically aren’t actual obstacles, but can’t be differentiated from solid ones by the system,” explains Petr Pořízka from Škoda’s development department.
Parking sensors with automatic braking stop the car if they detect an obstacle when parking. The sensors can also consider grass or a kerb as an obstacle.
In such cases, the vehicle stops, but that doesn’t mean the driver can’t finish the manoeuvre. The advice is simple: follow the warning, and if reversing, slow down below the safety threshold of 1.5 km/h, at which point the assistant won’t intervene. The same approach, combined with maximum caution, applies when the driver needs to pass very close to an obstacle—like a parked car or pole—with only a few centimetres to spare.
The emergency stop occurs at speeds above 1.5 km/h (1.5 mph); if the driver is driving slower, the assistant gives an acoustic warning when reversing, for example, but even if the driver does not react, the assistant does not intervene.
“Emergency braking can be sudden, but it signals a potential hazard. Only proceed with the manoeuvre if you’re absolutely sure you can do so safely,” adds Pořízka. It’s also wise to remember that even seemingly harmless grass might conceal hidden solid obstacles—and don’t forget about your mirrors when squeezing by tightly.