Some models without a combined rain sensor/light sensor are equipped with a speed-dependent wiper interval for the front wipers.
If the vehicle is decelerated to walking speed or a standstill, then the system automatically changes to the next slower interval setting. If the speed is increased, the wiper speed returns to the manually selected setting. If the window wash/wipe switch is moved while the system is switched on then the system is switched off. If the vehicle is decelerated to walking speed or a standstill again, then the system is switched back on again.